Index: lldb/include/lldb/Breakpoint/BreakpointResolverName.h
===================================================================
--- lldb/include/lldb/Breakpoint/BreakpointResolverName.h
+++ lldb/include/lldb/Breakpoint/BreakpointResolverName.h
@@ -44,7 +44,7 @@
 
   // Creates a function breakpoint by regular expression.  Takes over control
   // of the lifespan of func_regex.
-  BreakpointResolverName(Breakpoint *bkpt, RegularExpression func_regex,
+  BreakpointResolverName(Breakpoint *bkpt, RegularExpression &&func_regex,
                          lldb::LanguageType language, lldb::addr_t offset,
                          bool skip_prologue);
 
Index: lldb/include/lldb/DataFormatters/FormattersContainer.h
===================================================================
--- lldb/include/lldb/DataFormatters/FormattersContainer.h
+++ lldb/include/lldb/DataFormatters/FormattersContainer.h
@@ -67,19 +67,19 @@
   typedef typename ValueType::SharedPointer ValueSP;
   typedef std::map<KeyType, ValueSP> MapType;
   typedef typename MapType::iterator MapIterator;
-  typedef std::function<bool(KeyType, const ValueSP &)> ForEachCallback;
+  typedef std::function<bool(const KeyType &, const ValueSP &)> ForEachCallback;
 
   FormatMap(IFormatChangeListener *lst)
       : m_map(), m_map_mutex(), listener(lst) {}
 
-  void Add(KeyType name, const ValueSP &entry) {
+  void Add(KeyType &&name, const ValueSP &entry) {
     if (listener)
       entry->GetRevision() = listener->GetCurrentRevision();
     else
       entry->GetRevision() = 0;
 
     std::lock_guard<std::recursive_mutex> guard(m_map_mutex);
-    m_map[name] = entry;
+    m_map[std::move(name)] = entry;
     if (listener)
       listener->Changed();
   }
@@ -116,7 +116,7 @@
       std::lock_guard<std::recursive_mutex> guard(m_map_mutex);
       MapIterator pos, end = m_map.end();
       for (pos = m_map.begin(); pos != end; pos++) {
-        KeyType type = pos->first;
+        const KeyType &type = pos->first;
         if (!callback(type, pos->second))
           break;
       }
@@ -138,7 +138,7 @@
     return iter->second;
   }
 
-  KeyType GetKeyAtIndex(size_t index) {
+  const KeyType *GetKeyAtIndex(size_t index) {
     std::lock_guard<std::recursive_mutex> guard(m_map_mutex);
     MapIterator iter = m_map.begin();
     MapIterator end = m_map.end();
@@ -146,9 +146,9 @@
       iter++;
       index--;
       if (end == iter)
-        return KeyType();
+        return nullptr;
     }
-    return iter->first;
+    return &iter->first;
   }
 
 protected:
@@ -182,8 +182,8 @@
   FormattersContainer(std::string name, IFormatChangeListener *lst)
       : m_format_map(lst), m_name(name) {}
 
-  void Add(const MapKeyType &type, const MapValueType &entry) {
-    Add_Impl(type, entry, static_cast<KeyType *>(nullptr));
+  void Add(MapKeyType &&type, const MapValueType &entry) {
+    Add_Impl(std::move(type), entry, static_cast<KeyType *>(nullptr));
   }
 
   bool Delete(ConstString type) {
@@ -233,9 +233,9 @@
 
   DISALLOW_COPY_AND_ASSIGN(FormattersContainer);
 
-  void Add_Impl(const MapKeyType &type, const MapValueType &entry,
-                lldb::RegularExpressionSP *dummy) {
-    m_format_map.Add(type, entry);
+  void Add_Impl(MapKeyType &&type, const MapValueType &entry,
+                RegularExpression *dummy) {
+    m_format_map.Add(std::move(type), entry);
   }
 
   void Add_Impl(ConstString type, const MapValueType &entry,
@@ -247,12 +247,12 @@
     return m_format_map.Delete(type);
   }
 
-  bool Delete_Impl(ConstString type, lldb::RegularExpressionSP *dummy) {
+  bool Delete_Impl(ConstString type, RegularExpression *dummy) {
     std::lock_guard<std::recursive_mutex> guard(m_format_map.mutex());
     MapIterator pos, end = m_format_map.map().end();
     for (pos = m_format_map.map().begin(); pos != end; pos++) {
-      lldb::RegularExpressionSP regex = pos->first;
-      if (type.GetStringRef() == regex->GetText()) {
+      const RegularExpression &regex = pos->first;
+      if (type.GetStringRef() == regex.GetText()) {
         m_format_map.map().erase(pos);
         if (m_format_map.listener)
           m_format_map.listener->Changed();
@@ -273,32 +273,31 @@
 
   lldb::TypeNameSpecifierImplSP
   GetTypeNameSpecifierAtIndex_Impl(size_t index, ConstString *dummy) {
-    ConstString key = m_format_map.GetKeyAtIndex(index);
+    const ConstString *key = m_format_map.GetKeyAtIndex(index);
     if (key)
       return lldb::TypeNameSpecifierImplSP(
-          new TypeNameSpecifierImpl(key.AsCString(), false));
+          new TypeNameSpecifierImpl(key->AsCString(), false));
     else
       return lldb::TypeNameSpecifierImplSP();
   }
 
   lldb::TypeNameSpecifierImplSP
-  GetTypeNameSpecifierAtIndex_Impl(size_t index,
-                                   lldb::RegularExpressionSP *dummy) {
-    lldb::RegularExpressionSP regex = m_format_map.GetKeyAtIndex(index);
-    if (regex.get() == nullptr)
+  GetTypeNameSpecifierAtIndex_Impl(size_t index, RegularExpression *dummy) {
+    const RegularExpression *regex = m_format_map.GetKeyAtIndex(index);
+    if (!regex)
       return lldb::TypeNameSpecifierImplSP();
     return lldb::TypeNameSpecifierImplSP(
         new TypeNameSpecifierImpl(regex->GetText().str().c_str(), true));
   }
 
   bool Get_Impl(ConstString key, MapValueType &value,
-                lldb::RegularExpressionSP *dummy) {
+                RegularExpression *dummy) {
     llvm::StringRef key_str = key.GetStringRef();
     std::lock_guard<std::recursive_mutex> guard(m_format_map.mutex());
     MapIterator pos, end = m_format_map.map().end();
     for (pos = m_format_map.map().begin(); pos != end; pos++) {
-      lldb::RegularExpressionSP regex = pos->first;
-      if (regex->Execute(key_str)) {
+      const RegularExpression &regex = pos->first;
+      if (regex.Execute(key_str)) {
         value = pos->second;
         return true;
       }
@@ -307,12 +306,12 @@
   }
 
   bool GetExact_Impl(ConstString key, MapValueType &value,
-                     lldb::RegularExpressionSP *dummy) {
+                     RegularExpression *dummy) {
     std::lock_guard<std::recursive_mutex> guard(m_format_map.mutex());
     MapIterator pos, end = m_format_map.map().end();
     for (pos = m_format_map.map().begin(); pos != end; pos++) {
-      lldb::RegularExpressionSP regex = pos->first;
-      if (regex->GetText() == key.GetStringRef()) {
+      const RegularExpression &regex = pos->first;
+      if (regex.GetText() == key.GetStringRef()) {
         value = pos->second;
         return true;
       }
Index: lldb/include/lldb/DataFormatters/TypeCategory.h
===================================================================
--- lldb/include/lldb/DataFormatters/TypeCategory.h
+++ lldb/include/lldb/DataFormatters/TypeCategory.h
@@ -26,7 +26,7 @@
 template <typename FormatterImpl> class FormatterContainerPair {
 public:
   typedef FormattersContainer<ConstString, FormatterImpl> ExactMatchContainer;
-  typedef FormattersContainer<lldb::RegularExpressionSP, FormatterImpl>
+  typedef FormattersContainer<RegularExpression, FormatterImpl>
       RegexMatchContainer;
 
   typedef typename ExactMatchContainer::MapType ExactMatchMap;
Index: lldb/include/lldb/Interpreter/OptionValueRegex.h
===================================================================
--- lldb/include/lldb/Interpreter/OptionValueRegex.h
+++ lldb/include/lldb/Interpreter/OptionValueRegex.h
@@ -50,7 +50,7 @@
 
   void SetCurrentValue(const char *value) {
     if (value && value[0])
-      m_regex.Compile(llvm::StringRef(value));
+      m_regex = RegularExpression(llvm::StringRef(value));
     else
       m_regex = RegularExpression();
   }
Index: lldb/include/lldb/Target/Target.h
===================================================================
--- lldb/include/lldb/Target/Target.h
+++ lldb/include/lldb/Target/Target.h
@@ -598,7 +598,7 @@
       const FileSpecList *containingModules,
       const FileSpecList *source_file_list,
       const std::unordered_set<std::string> &function_names,
-      RegularExpression &source_regex, bool internal, bool request_hardware,
+      RegularExpression &&source_regex, bool internal, bool request_hardware,
       LazyBool move_to_nearest_code);
 
   // Use this to create a breakpoint from a load address
@@ -621,9 +621,9 @@
   // target setting, else we use the values passed in
   lldb::BreakpointSP CreateFuncRegexBreakpoint(
       const FileSpecList *containingModules,
-      const FileSpecList *containingSourceFiles, RegularExpression &func_regexp,
-      lldb::LanguageType requested_language, LazyBool skip_prologue,
-      bool internal, bool request_hardware);
+      const FileSpecList *containingSourceFiles,
+      RegularExpression &&func_regexp, lldb::LanguageType requested_language,
+      LazyBool skip_prologue, bool internal, bool request_hardware);
 
   // Use this to create a function breakpoint by name in containingModule, or
   // all modules if it is nullptr When "skip_prologue is set to
Index: lldb/include/lldb/Utility/RegularExpression.h
===================================================================
--- lldb/include/lldb/Utility/RegularExpression.h
+++ lldb/include/lldb/Utility/RegularExpression.h
@@ -15,7 +15,7 @@
 
 namespace lldb_private {
 
-class RegularExpression : public llvm::Regex {
+class RegularExpression {
 public:
   /// Default constructor.
   ///
@@ -27,31 +27,14 @@
   ~RegularExpression() = default;
 
   RegularExpression(const RegularExpression &rhs);
-  RegularExpression(RegularExpression &&rhs) = default;
-
-  RegularExpression &operator=(RegularExpression &&rhs) = default;
-  RegularExpression &operator=(const RegularExpression &rhs) = default;
-
-  /// Compile a regular expression.
-  ///
-  /// Compile a regular expression using the supplied regular expression text.
-  /// The compiled regular expression lives in this object so that it can be
-  /// readily used for regular expression matches. Execute() can be called
-  /// after the regular expression is compiled. Any previously compiled
-  /// regular expression contained in this object will be freed.
-  ///
-  /// \param[in] re
-  ///     A NULL terminated C string that represents the regular
-  ///     expression to compile.
-  ///
-  /// \return \b true if the regular expression compiles successfully, \b false
-  ///     otherwise.
-  bool Compile(llvm::StringRef string);
+  RegularExpression(RegularExpression &&rhs);
+  RegularExpression &operator=(RegularExpression &&rhs);
+  RegularExpression &operator=(const RegularExpression &rhs) = delete;
 
   /// Executes a regular expression.
   ///
   /// Execute a regular expression match using the compiled regular expression
-  /// that is already in this object against the match string \a s. If any
+  /// that is in this object against the match string \a s. If any
   /// parens are used for regular expression matches \a match_count should
   /// indicate the number of regmatch_t values that are present in \a
   /// match_ptr.
@@ -88,8 +71,16 @@
   bool IsValid() const;
 
   /// Return an error if the regular expression failed to compile.
+  /// The value is not valid if the object has been copy/move-ctored.
   llvm::Error GetError() const;
 
+  bool operator<(const RegularExpression &rhs) const {
+    return GetText() < rhs.GetText();
+  }
+  bool operator==(const RegularExpression &rhs) const {
+    return GetText() == rhs.GetText();
+  }
+
 private:
   /// A copy of the original regular expression text.
   std::string m_regex_text;
Index: lldb/source/API/SBTarget.cpp
===================================================================
--- lldb/source/API/SBTarget.cpp
+++ lldb/source/API/SBTarget.cpp
@@ -960,8 +960,8 @@
     const LazyBool skip_prologue = eLazyBoolCalculate;
 
     sb_bp = target_sp->CreateFuncRegexBreakpoint(
-        module_list.get(), comp_unit_list.get(), regexp, symbol_language,
-        skip_prologue, internal, hardware);
+        module_list.get(), comp_unit_list.get(), std::move(regexp),
+        symbol_language, skip_prologue, internal, hardware);
   }
 
   return LLDB_RECORD_RESULT(sb_bp);
@@ -1061,8 +1061,8 @@
     }
 
     sb_bp = target_sp->CreateSourceRegexBreakpoint(
-        module_list.get(), source_file_list.get(), func_names_set, regexp,
-        false, hardware, move_to_nearest_code);
+        module_list.get(), source_file_list.get(), func_names_set,
+        std::move(regexp), false, hardware, move_to_nearest_code);
   }
 
   return LLDB_RECORD_RESULT(sb_bp);
Index: lldb/source/API/SBTypeCategory.cpp
===================================================================
--- lldb/source/API/SBTypeCategory.cpp
+++ lldb/source/API/SBTypeCategory.cpp
@@ -364,8 +364,8 @@
 
   if (type_name.IsRegex())
     m_opaque_sp->GetRegexTypeFormatsContainer()->Add(
-        lldb::RegularExpressionSP(new RegularExpression(
-            llvm::StringRef::withNullAsEmpty(type_name.GetName()))),
+        RegularExpression(
+            llvm::StringRef::withNullAsEmpty(type_name.GetName())),
         format.GetSP());
   else
     m_opaque_sp->GetTypeFormatsContainer()->Add(
@@ -443,8 +443,8 @@
 
   if (type_name.IsRegex())
     m_opaque_sp->GetRegexTypeSummariesContainer()->Add(
-        lldb::RegularExpressionSP(new RegularExpression(
-            llvm::StringRef::withNullAsEmpty(type_name.GetName()))),
+        RegularExpression(
+            llvm::StringRef::withNullAsEmpty(type_name.GetName())),
         summary.GetSP());
   else
     m_opaque_sp->GetTypeSummariesContainer()->Add(
@@ -488,8 +488,8 @@
 
   if (type_name.IsRegex())
     m_opaque_sp->GetRegexTypeFiltersContainer()->Add(
-        lldb::RegularExpressionSP(new RegularExpression(
-            llvm::StringRef::withNullAsEmpty(type_name.GetName()))),
+        RegularExpression(
+            llvm::StringRef::withNullAsEmpty(type_name.GetName())),
         filter.GetSP());
   else
     m_opaque_sp->GetTypeFiltersContainer()->Add(
@@ -567,8 +567,8 @@
 
   if (type_name.IsRegex())
     m_opaque_sp->GetRegexTypeSyntheticsContainer()->Add(
-        lldb::RegularExpressionSP(new RegularExpression(
-            llvm::StringRef::withNullAsEmpty(type_name.GetName()))),
+        RegularExpression(
+            llvm::StringRef::withNullAsEmpty(type_name.GetName())),
         synth.GetSP());
   else
     m_opaque_sp->GetTypeSyntheticsContainer()->Add(
Index: lldb/source/Breakpoint/BreakpointResolverName.cpp
===================================================================
--- lldb/source/Breakpoint/BreakpointResolverName.cpp
+++ lldb/source/Breakpoint/BreakpointResolverName.cpp
@@ -31,7 +31,8 @@
       m_class_name(), m_regex(), m_match_type(type), m_language(language),
       m_skip_prologue(skip_prologue) {
   if (m_match_type == Breakpoint::Regexp) {
-    if (!m_regex.Compile(llvm::StringRef::withNullAsEmpty(name_cstr))) {
+    m_regex = RegularExpression(llvm::StringRef::withNullAsEmpty(name_cstr));
+    if (!m_regex.IsValid()) {
       Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_BREAKPOINTS));
 
       if (log)
@@ -70,7 +71,7 @@
 }
 
 BreakpointResolverName::BreakpointResolverName(Breakpoint *bkpt,
-                                               RegularExpression func_regex,
+                                               RegularExpression &&func_regex,
                                                lldb::LanguageType language,
                                                lldb::addr_t offset,
                                                bool skip_prologue)
@@ -125,9 +126,8 @@
   success = options_dict.GetValueForKeyAsString(
       GetKey(OptionNames::RegexString), regex_text);
   if (success) {
-    RegularExpression regex(regex_text);
-    return new BreakpointResolverName(bkpt, regex, language, offset,
-                                      skip_prologue);
+    return new BreakpointResolverName(bkpt, RegularExpression(regex_text),
+                                      language, offset, skip_prologue);
   } else {
     StructuredData::Array *names_array;
     success = options_dict.GetValueForKeyAsArray(
Index: lldb/source/Commands/CommandCompletions.cpp
===================================================================
--- lldb/source/Commands/CommandCompletions.cpp
+++ lldb/source/Commands/CommandCompletions.cpp
@@ -448,7 +448,7 @@
     pos = regex_str.insert(pos, '\\');
     pos = find_if(pos + 2, regex_str.end(), regex_chars);
   }
-  m_regex.Compile(regex_str);
+  m_regex = RegularExpression(regex_str);
 }
 
 lldb::SearchDepth CommandCompletions::SymbolCompleter::GetDepth() {
Index: lldb/source/Commands/CommandObjectBreakpoint.cpp
===================================================================
--- lldb/source/Commands/CommandObjectBreakpoint.cpp
+++ lldb/source/Commands/CommandObjectBreakpoint.cpp
@@ -690,13 +690,10 @@
           return false;
         }
 
-        bp_sp = target->CreateFuncRegexBreakpoint(&(m_options.m_modules), 
-                                                  &(m_options.m_filenames), 
-                                                  regexp,
-                                                  m_options.m_language, 
-                                                  m_options.m_skip_prologue, 
-                                                  internal,
-                                                  m_options.m_hardware);
+        bp_sp = target->CreateFuncRegexBreakpoint(
+            &(m_options.m_modules), &(m_options.m_filenames), std::move(regexp),
+            m_options.m_language, m_options.m_skip_prologue, internal,
+            m_options.m_hardware);
       }
       break;
     case eSetTypeSourceRegexp: // Breakpoint by regexp on source text.
@@ -723,15 +720,10 @@
         result.SetStatus(eReturnStatusFailed);
         return false;
       }
-      bp_sp = 
-          target->CreateSourceRegexBreakpoint(&(m_options.m_modules), 
-                                              &(m_options.m_filenames),
-                                              m_options
-                                                  .m_source_regex_func_names,
-                                              regexp,
-                                              internal,
-                                              m_options.m_hardware,
-                                              m_options.m_move_to_nearest_code);
+      bp_sp = target->CreateSourceRegexBreakpoint(
+          &(m_options.m_modules), &(m_options.m_filenames),
+          m_options.m_source_regex_func_names, std::move(regexp), internal,
+          m_options.m_hardware, m_options.m_move_to_nearest_code);
     } break;
     case eSetTypeException: {
       Status precond_error;
Index: lldb/source/Commands/CommandObjectFrame.cpp
===================================================================
--- lldb/source/Commands/CommandObjectFrame.cpp
+++ lldb/source/Commands/CommandObjectFrame.cpp
@@ -534,7 +534,7 @@
             const size_t regex_start_index = regex_var_list.GetSize();
             llvm::StringRef name_str = entry.ref;
             RegularExpression regex(name_str);
-            if (regex.Compile(name_str)) {
+            if (regex.IsValid()) {
               size_t num_matches = 0;
               const size_t num_new_regex_vars =
                   variable_list->AppendVariablesIfUnique(regex, regex_var_list,
Index: lldb/source/Commands/CommandObjectType.cpp
===================================================================
--- lldb/source/Commands/CommandObjectType.cpp
+++ lldb/source/Commands/CommandObjectType.cpp
@@ -692,17 +692,18 @@
 
       ConstString typeCS(arg_entry.ref);
       if (m_command_options.m_regex) {
-        RegularExpressionSP typeRX(new RegularExpression());
-        if (!typeRX->Compile(arg_entry.ref)) {
+        RegularExpression typeRX(arg_entry.ref);
+        if (!typeRX.IsValid()) {
           result.AppendError(
               "regex format error (maybe this is not really a regex?)");
           result.SetStatus(eReturnStatusFailed);
           return false;
         }
         category_sp->GetRegexTypeSummariesContainer()->Delete(typeCS);
-        category_sp->GetRegexTypeFormatsContainer()->Add(typeRX, entry);
+        category_sp->GetRegexTypeFormatsContainer()->Add(std::move(typeRX),
+                                                         entry);
       } else
-        category_sp->GetTypeFormatsContainer()->Add(typeCS, entry);
+        category_sp->GetTypeFormatsContainer()->Add(std::move(typeCS), entry);
     }
 
     result.SetStatus(eReturnStatusSuccessFinishNoResult);
@@ -1044,9 +1045,9 @@
     std::unique_ptr<RegularExpression> formatter_regex;
 
     if (m_options.m_category_regex.OptionWasSet()) {
-      category_regex.reset(new RegularExpression());
-      if (!category_regex->Compile(
-              m_options.m_category_regex.GetCurrentValueAsRef())) {
+      category_regex.reset(new RegularExpression(
+          m_options.m_category_regex.GetCurrentValueAsRef()));
+      if (!category_regex->IsValid()) {
         result.AppendErrorWithFormat(
             "syntax error in category regular expression '%s'",
             m_options.m_category_regex.GetCurrentValueAsRef().str().c_str());
@@ -1057,8 +1058,9 @@
 
     if (argc == 1) {
       const char *arg = command.GetArgumentAtIndex(0);
-      formatter_regex.reset(new RegularExpression());
-      if (!formatter_regex->Compile(llvm::StringRef::withNullAsEmpty(arg))) {
+      formatter_regex.reset(
+          new RegularExpression(llvm::StringRef::withNullAsEmpty(arg)));
+      if (!formatter_regex->IsValid()) {
         result.AppendErrorWithFormat("syntax error in regular expression '%s'",
                                      arg);
         result.SetStatus(eReturnStatusFailed);
@@ -1099,13 +1101,13 @@
 
       foreach
         .SetWithRegex([&result, &formatter_regex, &any_printed](
-                          RegularExpressionSP regex_sp,
+                          const RegularExpression &regex,
                           const FormatterSharedPointer &format_sp) -> bool {
           if (formatter_regex) {
             bool escape = true;
-            if (regex_sp->GetText() == formatter_regex->GetText()) {
+            if (regex.GetText() == formatter_regex->GetText()) {
               escape = false;
-            } else if (formatter_regex->Execute(regex_sp->GetText())) {
+            } else if (formatter_regex->Execute(regex.GetText())) {
               escape = false;
             }
 
@@ -1115,7 +1117,7 @@
 
           any_printed = true;
           result.GetOutputStream().Printf("%s: %s\n",
-                                          regex_sp->GetText().str().c_str(),
+                                          regex.GetText().str().c_str(),
                                           format_sp->GetDescription().c_str());
           return true;
         });
@@ -1630,8 +1632,8 @@
   }
 
   if (type == eRegexSummary) {
-    RegularExpressionSP typeRX(new RegularExpression());
-    if (!typeRX->Compile(type_name.GetStringRef())) {
+    RegularExpression typeRX(type_name.GetStringRef());
+    if (!typeRX.IsValid()) {
       if (error)
         error->SetErrorString(
             "regex format error (maybe this is not really a regex?)");
@@ -1639,7 +1641,7 @@
     }
 
     category->GetRegexTypeSummariesContainer()->Delete(type_name);
-    category->GetRegexTypeSummariesContainer()->Add(typeRX, entry);
+    category->GetRegexTypeSummariesContainer()->Add(std::move(typeRX), entry);
 
     return true;
   } else if (type == eNamedSummary) {
@@ -1647,7 +1649,7 @@
     DataVisualization::NamedSummaryFormats::Add(type_name, entry);
     return true;
   } else {
-    category->GetTypeSummariesContainer()->Add(type_name, entry);
+    category->GetTypeSummariesContainer()->Add(std::move(type_name), entry);
     return true;
   }
 }
@@ -2116,9 +2118,9 @@
     std::unique_ptr<RegularExpression> regex;
 
     if (argc == 1) {
-      regex.reset(new RegularExpression());
       const char *arg = command.GetArgumentAtIndex(0);
-      if (!regex->Compile(llvm::StringRef::withNullAsEmpty(arg))) {
+      regex.reset(new RegularExpression(llvm::StringRef::withNullAsEmpty(arg)));
+      if (!regex->IsValid()) {
         result.AppendErrorWithFormat(
             "syntax error in category regular expression '%s'", arg);
         result.SetStatus(eReturnStatusFailed);
@@ -2370,8 +2372,8 @@
   }
 
   if (type == eRegexSynth) {
-    RegularExpressionSP typeRX(new RegularExpression());
-    if (!typeRX->Compile(type_name.GetStringRef())) {
+    RegularExpression typeRX(type_name.GetStringRef());
+    if (!typeRX.IsValid()) {
       if (error)
         error->SetErrorString(
             "regex format error (maybe this is not really a regex?)");
@@ -2379,11 +2381,11 @@
     }
 
     category->GetRegexTypeSyntheticsContainer()->Delete(type_name);
-    category->GetRegexTypeSyntheticsContainer()->Add(typeRX, entry);
+    category->GetRegexTypeSyntheticsContainer()->Add(std::move(typeRX), entry);
 
     return true;
   } else {
-    category->GetTypeSyntheticsContainer()->Add(type_name, entry);
+    category->GetTypeSyntheticsContainer()->Add(std::move(type_name), entry);
     return true;
   }
 }
@@ -2498,8 +2500,8 @@
     }
 
     if (type == eRegexFilter) {
-      RegularExpressionSP typeRX(new RegularExpression());
-      if (!typeRX->Compile(type_name.GetStringRef())) {
+      RegularExpression typeRX(type_name.GetStringRef());
+      if (!typeRX.IsValid()) {
         if (error)
           error->SetErrorString(
               "regex format error (maybe this is not really a regex?)");
@@ -2507,11 +2509,11 @@
       }
 
       category->GetRegexTypeFiltersContainer()->Delete(type_name);
-      category->GetRegexTypeFiltersContainer()->Add(typeRX, entry);
+      category->GetRegexTypeFiltersContainer()->Add(std::move(typeRX), entry);
 
       return true;
     } else {
-      category->GetTypeFiltersContainer()->Add(type_name, entry);
+      category->GetTypeFiltersContainer()->Add(std::move(type_name), entry);
       return true;
     }
   }
Index: lldb/source/Core/AddressResolverName.cpp
===================================================================
--- lldb/source/Core/AddressResolverName.cpp
+++ lldb/source/Core/AddressResolverName.cpp
@@ -36,7 +36,8 @@
     : AddressResolver(), m_func_name(func_name), m_class_name(nullptr),
       m_regex(), m_match_type(type) {
   if (m_match_type == AddressResolver::Regexp) {
-    if (!m_regex.Compile(m_func_name.GetStringRef())) {
+    m_regex = RegularExpression(m_func_name.GetStringRef());
+    if (!m_regex.IsValid()) {
       Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_BREAKPOINTS));
 
       if (log)
Index: lldb/source/DataFormatters/FormatManager.cpp
===================================================================
--- lldb/source/DataFormatters/FormatManager.cpp
+++ lldb/source/DataFormatters/FormatManager.cpp
@@ -946,10 +946,10 @@
   lldb::TypeSummaryImplSP string_array_format(
       new StringSummaryFormat(string_array_flags, "${var%s}"));
 
-  lldb::RegularExpressionSP any_size_char_arr(
-      new RegularExpression(llvm::StringRef("char \\[[0-9]+\\]")));
-  lldb::RegularExpressionSP any_size_wchar_arr(
-      new RegularExpression(llvm::StringRef("wchar_t \\[[0-9]+\\]")));
+  RegularExpression any_size_char_arr(llvm::StringRef("char \\[[0-9]+\\]"));
+#if 0 // FIXME: unused:
+  RegularExpression any_size_wchar_arr(llvm::StringRef("wchar_t \\[[0-9]+\\]"));
+#endif
 
   TypeCategoryImpl::SharedPointer sys_category_sp =
       GetCategory(m_system_category_name);
@@ -958,8 +958,8 @@
                                                     string_format);
   sys_category_sp->GetTypeSummariesContainer()->Add(
       ConstString("unsigned char *"), string_format);
-  sys_category_sp->GetRegexTypeSummariesContainer()->Add(any_size_char_arr,
-                                                         string_array_format);
+  sys_category_sp->GetRegexTypeSummariesContainer()->Add(
+      std::move(any_size_char_arr), string_array_format);
 
   lldb::TypeSummaryImplSP ostype_summary(
       new StringSummaryFormat(TypeSummaryImpl::Flags()
Index: lldb/source/DataFormatters/FormattersHelpers.cpp
===================================================================
--- lldb/source/DataFormatters/FormattersHelpers.cpp
+++ lldb/source/DataFormatters/FormattersHelpers.cpp
@@ -29,10 +29,10 @@
 
   if (regex)
     category_sp->GetRegexTypeFormatsContainer()->Add(
-        RegularExpressionSP(new RegularExpression(type_name.GetStringRef())),
-        format_sp);
+        RegularExpression(type_name.GetStringRef()), format_sp);
   else
-    category_sp->GetTypeFormatsContainer()->Add(type_name, format_sp);
+    category_sp->GetTypeFormatsContainer()->Add(std::move(type_name),
+                                                format_sp);
 }
 
 void lldb_private::formatters::AddSummary(
@@ -40,10 +40,10 @@
     ConstString type_name, bool regex) {
   if (regex)
     category_sp->GetRegexTypeSummariesContainer()->Add(
-        RegularExpressionSP(new RegularExpression(type_name.GetStringRef())),
-        summary_sp);
+        RegularExpression(type_name.GetStringRef()), summary_sp);
   else
-    category_sp->GetTypeSummariesContainer()->Add(type_name, summary_sp);
+    category_sp->GetTypeSummariesContainer()->Add(std::move(type_name),
+                                                  summary_sp);
 }
 
 void lldb_private::formatters::AddStringSummary(
@@ -53,10 +53,10 @@
 
   if (regex)
     category_sp->GetRegexTypeSummariesContainer()->Add(
-        RegularExpressionSP(new RegularExpression(type_name.GetStringRef())),
-        summary_sp);
+        RegularExpression(type_name.GetStringRef()), summary_sp);
   else
-    category_sp->GetTypeSummariesContainer()->Add(type_name, summary_sp);
+    category_sp->GetTypeSummariesContainer()->Add(std::move(type_name),
+                                                  summary_sp);
 }
 
 void lldb_private::formatters::AddOneLineSummary(
@@ -67,10 +67,10 @@
 
   if (regex)
     category_sp->GetRegexTypeSummariesContainer()->Add(
-        RegularExpressionSP(new RegularExpression(type_name.GetStringRef())),
-        summary_sp);
+        RegularExpression(type_name.GetStringRef()), summary_sp);
   else
-    category_sp->GetTypeSummariesContainer()->Add(type_name, summary_sp);
+    category_sp->GetTypeSummariesContainer()->Add(std::move(type_name),
+                                                  summary_sp);
 }
 
 void lldb_private::formatters::AddCXXSummary(
@@ -81,10 +81,10 @@
       new CXXFunctionSummaryFormat(flags, funct, description));
   if (regex)
     category_sp->GetRegexTypeSummariesContainer()->Add(
-        RegularExpressionSP(new RegularExpression(type_name.GetStringRef())),
-        summary_sp);
+        RegularExpression(type_name.GetStringRef()), summary_sp);
   else
-    category_sp->GetTypeSummariesContainer()->Add(type_name, summary_sp);
+    category_sp->GetTypeSummariesContainer()->Add(std::move(type_name),
+                                                  summary_sp);
 }
 
 void lldb_private::formatters::AddCXXSynthetic(
@@ -96,10 +96,10 @@
       new CXXSyntheticChildren(flags, description, generator));
   if (regex)
     category_sp->GetRegexTypeSyntheticsContainer()->Add(
-        RegularExpressionSP(new RegularExpression(type_name.GetStringRef())),
-        synth_sp);
+        RegularExpression(type_name.GetStringRef()), synth_sp);
   else
-    category_sp->GetTypeSyntheticsContainer()->Add(type_name, synth_sp);
+    category_sp->GetTypeSyntheticsContainer()->Add(std::move(type_name),
+                                                   synth_sp);
 }
 
 void lldb_private::formatters::AddFilter(
@@ -111,10 +111,10 @@
     filter_sp->AddExpressionPath(child);
   if (regex)
     category_sp->GetRegexTypeFiltersContainer()->Add(
-        RegularExpressionSP(new RegularExpression(type_name.GetStringRef())),
-        filter_sp);
+        RegularExpression(type_name.GetStringRef()), filter_sp);
   else
-    category_sp->GetTypeFiltersContainer()->Add(type_name, filter_sp);
+    category_sp->GetTypeFiltersContainer()->Add(std::move(type_name),
+                                                filter_sp);
 }
 
 size_t lldb_private::formatters::ExtractIndexFromString(const char *item_name) {
Index: lldb/source/Interpreter/CommandObjectRegexCommand.cpp
===================================================================
--- lldb/source/Interpreter/CommandObjectRegexCommand.cpp
+++ lldb/source/Interpreter/CommandObjectRegexCommand.cpp
@@ -73,8 +73,9 @@
                                                 const char *command_cstr) {
   m_entries.resize(m_entries.size() + 1);
   // Only add the regular expression if it compiles
-  if (m_entries.back().regex.Compile(
-          llvm::StringRef::withNullAsEmpty(re_cstr))) {
+  m_entries.back().regex =
+      RegularExpression(llvm::StringRef::withNullAsEmpty(re_cstr));
+  if (m_entries.back().regex.IsValid()) {
     m_entries.back().command.assign(command_cstr);
     return true;
   }
Index: lldb/source/Interpreter/OptionValueRegex.cpp
===================================================================
--- lldb/source/Interpreter/OptionValueRegex.cpp
+++ lldb/source/Interpreter/OptionValueRegex.cpp
@@ -46,7 +46,8 @@
 
   case eVarSetOperationReplace:
   case eVarSetOperationAssign:
-    if (m_regex.Compile(value)) {
+    m_regex = RegularExpression(value);
+    if (m_regex.IsValid()) {
       m_value_was_set = true;
       NotifyValueChanged();
     } else if (llvm::Error err = m_regex.GetError()) {
Index: lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
===================================================================
--- lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
+++ lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp
@@ -547,8 +547,8 @@
       ConstString("^std::__[[:alnum:]]+::atomic<.+>$"), stl_synth_flags, true);
 
   cpp_category_sp->GetRegexTypeSyntheticsContainer()->Add(
-      RegularExpressionSP(new RegularExpression(
-          llvm::StringRef("^(std::__[[:alnum:]]+::)deque<.+>(( )?&)?$"))),
+      RegularExpression(
+          llvm::StringRef("^(std::__[[:alnum:]]+::)deque<.+>(( )?&)?$")),
       SyntheticChildrenSP(new ScriptedSyntheticChildren(
           stl_synth_flags,
           "lldb.formatters.cpp.libcxx.stddeque_SynthProvider")));
@@ -744,38 +744,32 @@
       false);
 
   cpp_category_sp->GetRegexTypeSyntheticsContainer()->Add(
-      RegularExpressionSP(
-          new RegularExpression(llvm::StringRef("^std::vector<.+>(( )?&)?$"))),
+      RegularExpression(llvm::StringRef("^std::vector<.+>(( )?&)?$")),
       SyntheticChildrenSP(new ScriptedSyntheticChildren(
           stl_synth_flags,
           "lldb.formatters.cpp.gnu_libstdcpp.StdVectorSynthProvider")));
   cpp_category_sp->GetRegexTypeSyntheticsContainer()->Add(
-      RegularExpressionSP(
-          new RegularExpression(llvm::StringRef("^std::map<.+> >(( )?&)?$"))),
+      RegularExpression(llvm::StringRef("^std::map<.+> >(( )?&)?$")),
       SyntheticChildrenSP(new ScriptedSyntheticChildren(
           stl_synth_flags,
           "lldb.formatters.cpp.gnu_libstdcpp.StdMapSynthProvider")));
   cpp_category_sp->GetRegexTypeSyntheticsContainer()->Add(
-      RegularExpressionSP(new RegularExpression(
-          llvm::StringRef("^std::(__cxx11::)?list<.+>(( )?&)?$"))),
+      RegularExpression(llvm::StringRef("^std::(__cxx11::)?list<.+>(( )?&)?$")),
       SyntheticChildrenSP(new ScriptedSyntheticChildren(
           stl_synth_flags,
           "lldb.formatters.cpp.gnu_libstdcpp.StdListSynthProvider")));
   stl_summary_flags.SetDontShowChildren(false);
   stl_summary_flags.SetSkipPointers(true);
   cpp_category_sp->GetRegexTypeSummariesContainer()->Add(
-      RegularExpressionSP(
-          new RegularExpression(llvm::StringRef("^std::vector<.+>(( )?&)?$"))),
+      RegularExpression(llvm::StringRef("^std::vector<.+>(( )?&)?$")),
       TypeSummaryImplSP(
           new StringSummaryFormat(stl_summary_flags, "size=${svar%#}")));
   cpp_category_sp->GetRegexTypeSummariesContainer()->Add(
-      RegularExpressionSP(
-          new RegularExpression(llvm::StringRef("^std::map<.+> >(( )?&)?$"))),
+      RegularExpression(llvm::StringRef("^std::map<.+> >(( )?&)?$")),
       TypeSummaryImplSP(
           new StringSummaryFormat(stl_summary_flags, "size=${svar%#}")));
   cpp_category_sp->GetRegexTypeSummariesContainer()->Add(
-      RegularExpressionSP(new RegularExpression(
-          llvm::StringRef("^std::(__cxx11::)?list<.+>(( )?&)?$"))),
+      RegularExpression(llvm::StringRef("^std::(__cxx11::)?list<.+>(( )?&)?$")),
       TypeSummaryImplSP(
           new StringSummaryFormat(stl_summary_flags, "size=${svar%#}")));
 
Index: lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
===================================================================
--- lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
+++ lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
@@ -582,9 +582,9 @@
     case 0:
       break;
     case 1: {
-      regex_up.reset(new RegularExpression());
-      if (!regex_up->Compile(llvm::StringRef::withNullAsEmpty(
-              command.GetArgumentAtIndex(0)))) {
+      regex_up.reset(new RegularExpression(
+          llvm::StringRef::withNullAsEmpty(command.GetArgumentAtIndex(0))));
+      if (!regex_up->IsValid()) {
         result.AppendError(
             "invalid argument - please provide a valid regular expression");
         result.SetStatus(lldb::eReturnStatusFailed);
Index: lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.cpp
===================================================================
--- lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.cpp
+++ lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptRuntime.cpp
@@ -446,15 +446,21 @@
   llvm::SmallVector<llvm::StringRef, 4> matches;
 
   bool matched = false;
-  if (regex.Compile(llvm::StringRef("^([0-9]+),([0-9]+),([0-9]+)$")) &&
-      regex.Execute(coord_s, &matches))
-    matched = true;
-  else if (regex.Compile(llvm::StringRef("^([0-9]+),([0-9]+)$")) &&
-           regex.Execute(coord_s, &matches))
-    matched = true;
-  else if (regex.Compile(llvm::StringRef("^([0-9]+)$")) &&
-           regex.Execute(coord_s, &matches))
-    matched = true;
+  if (!matched) {
+    regex = RegularExpression(llvm::StringRef("^([0-9]+),([0-9]+),([0-9]+)$"));
+    if (regex.Execute(coord_s, &matches))
+      matched = true;
+  }
+  if (!matched) {
+    regex = RegularExpression(llvm::StringRef("^([0-9]+),([0-9]+)$"));
+    if (regex.Execute(coord_s, &matches))
+      matched = true;
+  }
+  if (!matched) {
+    regex = RegularExpression(llvm::StringRef("^([0-9]+)$"));
+    if (regex.Execute(coord_s, &matches))
+      matched = true;
+  }
 
   if (!matched)
     return false;
Index: lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunication.cpp
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunication.cpp
+++ lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunication.cpp
@@ -332,11 +332,12 @@
             std::string regex_str = "^";
             regex_str += echo_packet;
             regex_str += "$";
-            response_regex.Compile(regex_str);
+            response_regex = RegularExpression(regex_str);
           } else {
             echo_packet_len =
                 ::snprintf(echo_packet, sizeof(echo_packet), "qC");
-            response_regex.Compile(llvm::StringRef("^QC[0-9A-Fa-f]+$"));
+            response_regex =
+                RegularExpression(llvm::StringRef("^QC[0-9A-Fa-f]+$"));
           }
 
           PacketResult echo_packet_result =
Index: lldb/source/Target/Target.cpp
===================================================================
--- lldb/source/Target/Target.cpp
+++ lldb/source/Target/Target.cpp
@@ -307,14 +307,14 @@
     const FileSpecList *containingModules,
     const FileSpecList *source_file_spec_list,
     const std::unordered_set<std::string> &function_names,
-    RegularExpression &source_regex, bool internal, bool hardware,
+    RegularExpression &&source_regex, bool internal, bool hardware,
     LazyBool move_to_nearest_code) {
   SearchFilterSP filter_sp(GetSearchFilterForModuleAndCUList(
       containingModules, source_file_spec_list));
   if (move_to_nearest_code == eLazyBoolCalculate)
     move_to_nearest_code = GetMoveToNearestCode() ? eLazyBoolYes : eLazyBoolNo;
   BreakpointResolverSP resolver_sp(new BreakpointResolverFileRegex(
-      nullptr, source_regex, function_names,
+      nullptr, std::move(source_regex), function_names,
       !static_cast<bool>(move_to_nearest_code)));
 
   return CreateBreakpoint(filter_sp, resolver_sp, internal, hardware, true);
@@ -549,7 +549,7 @@
 
 BreakpointSP Target::CreateFuncRegexBreakpoint(
     const FileSpecList *containingModules,
-    const FileSpecList *containingSourceFiles, RegularExpression &func_regex,
+    const FileSpecList *containingSourceFiles, RegularExpression &&func_regex,
     lldb::LanguageType requested_language, LazyBool skip_prologue,
     bool internal, bool hardware) {
   SearchFilterSP filter_sp(GetSearchFilterForModuleAndCUList(
@@ -558,7 +558,7 @@
                   ? GetSkipPrologue()
                   : static_cast<bool>(skip_prologue);
   BreakpointResolverSP resolver_sp(new BreakpointResolverName(
-      nullptr, func_regex, requested_language, 0, skip));
+      nullptr, std::move(func_regex), requested_language, 0, skip));
 
   return CreateBreakpoint(filter_sp, resolver_sp, internal, hardware, true);
 }
Index: lldb/source/Target/ThreadPlanStepInRange.cpp
===================================================================
--- lldb/source/Target/ThreadPlanStepInRange.cpp
+++ lldb/source/Target/ThreadPlanStepInRange.cpp
@@ -315,8 +315,8 @@
   auto name_ref = llvm::StringRef::withNullAsEmpty(name);
   if (!m_avoid_regexp_up)
     m_avoid_regexp_up.reset(new RegularExpression(name_ref));
-
-  m_avoid_regexp_up->Compile(name_ref);
+  else
+    *m_avoid_regexp_up = RegularExpression(name_ref);
 }
 
 void ThreadPlanStepInRange::SetDefaultFlagValue(uint32_t new_value) {
Index: lldb/source/Utility/RegularExpression.cpp
===================================================================
--- lldb/source/Utility/RegularExpression.cpp
+++ lldb/source/Utility/RegularExpression.cpp
@@ -12,26 +12,36 @@
 
 using namespace lldb_private;
 
-RegularExpression::RegularExpression(llvm::StringRef str) { Compile(str); }
+RegularExpression::RegularExpression(llvm::StringRef str) {
+  m_regex_text = str;
+}
 
+// m_regex must not be copied as it contains pointers to RHS m_regex_text.
 RegularExpression::RegularExpression(const RegularExpression &rhs)
-    : RegularExpression() {
-  Compile(rhs.GetText());
-}
+    : RegularExpression(rhs.m_regex_text) {}
 
-bool RegularExpression::Compile(llvm::StringRef str) {
-  m_regex_text = str;
-  m_regex = llvm::Regex(str);
-  return IsValid();
+// m_regex must not be moved as it contains pointers to RHS m_regex_text.
+RegularExpression::RegularExpression(RegularExpression &&rhs)
+    : RegularExpression(std::move(rhs.m_regex_text)) {}
+
+// m_regex must not be moved as it contains pointers to RHS m_regex_text.
+RegularExpression &RegularExpression::operator=(RegularExpression &&rhs) {
+  m_regex_text = std::move(rhs.m_regex_text);
+  m_regex = llvm::Regex();
+  return *this;
 }
 
 bool RegularExpression::Execute(
     llvm::StringRef str,
     llvm::SmallVectorImpl<llvm::StringRef> *matches) const {
+  if (!IsValid())
+    return false;
   return m_regex.match(str, matches);
 }
 
 bool RegularExpression::IsValid() const {
+  if (m_regex.empty())
+    m_regex = llvm::Regex(m_regex_text);
   std::string discarded;
   return m_regex.isValid(discarded);
 }
@@ -39,6 +49,8 @@
 llvm::StringRef RegularExpression::GetText() const { return m_regex_text; }
 
 llvm::Error RegularExpression::GetError() const {
+  if (m_regex.empty())
+    m_regex = llvm::Regex(m_regex_text);
   std::string error;
   if (!m_regex.isValid(error))
     return llvm::make_error<llvm::StringError>(llvm::inconvertibleErrorCode(),
Index: llvm/include/llvm/Support/Regex.h
===================================================================
--- llvm/include/llvm/Support/Regex.h
+++ llvm/include/llvm/Support/Regex.h
@@ -58,6 +58,9 @@
     /// matching, if any.
     bool isValid(std::string &Error) const;
 
+    // Return whether constructor has been called with no parameters.
+    bool empty() const { return preg == nullptr; }
+
     /// getNumMatches - In a valid regex, return the number of parenthesized
     /// matches it contains.  The number filled in by match will include this
     /// many entries plus one for the whole regex (as element 0).