diff --git a/clang/include/clang/Tooling/Inclusions/HeaderIncludes.h b/clang/include/clang/Tooling/Inclusions/HeaderIncludes.h
--- a/clang/include/clang/Tooling/Inclusions/HeaderIncludes.h
+++ b/clang/include/clang/Tooling/Inclusions/HeaderIncludes.h
@@ -129,6 +129,23 @@
   llvm::Regex IncludeRegex;
 };
 
+/// \returns a regex that can match various styles of C++ includes.
+/// For example:
+/// \code
+/// #include <foo.h>
+/// @import bar;
+/// #include "bar.h"
+/// \endcode
+llvm::Regex getCppIncludeRegex();
+
+/// \returns the last match in the list of matches that is not empty.
+llvm::StringRef getIncludeNameFromMatches(
+    const llvm::SmallVectorImpl<llvm::StringRef> &Matches);
+
+/// \returns the given include name and removes the following symbols from the
+/// beginning and ending of the include name: " > < ;
+llvm::StringRef trimInclude(llvm::StringRef IncludeName);
+
 } // namespace tooling
 } // namespace clang
 
diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -2722,23 +2722,6 @@
   }
 }
 
-namespace {
-
-const char CppIncludeRegexPattern[] =
-    R"(^[\t\ ]*[@#][\t\ ]*(import|include)([^"]*("[^"]+")|[^<]*(<[^>]+>)|[\t\ ]*([^;]+;)))";
-} // anonymous namespace
-
-// Returns the last match group in the above regex (CppIncludeRegexPattern) that
-// is not empty.
-StringRef getIncludeNameFromMatches(const SmallVectorImpl<StringRef> &Matches) {
-  for (int i = Matches.size() - 1; i > 0; i--) {
-    if (!Matches[i].empty())
-      return Matches[i];
-  }
-  llvm_unreachable("No non-empty match group found in list of matches");
-  return StringRef();
-}
-
 tooling::Replacements sortCppIncludes(const FormatStyle &Style, StringRef Code,
                                       ArrayRef<tooling::Range> Ranges,
                                       StringRef FileName,
@@ -2748,7 +2731,7 @@
                       .StartsWith("\xEF\xBB\xBF", 3) // UTF-8 BOM
                       .Default(0);
   unsigned SearchFrom = 0;
-  llvm::Regex IncludeRegex(CppIncludeRegexPattern);
+  llvm::Regex IncludeRegex(tooling::getCppIncludeRegex());
   SmallVector<StringRef, 4> Matches;
   SmallVector<IncludeDirective, 16> IncludesInBlock;
 
@@ -2804,7 +2787,7 @@
     bool MergeWithNextLine = Trimmed.endswith("\\");
     if (!FormattingOff && !MergeWithNextLine) {
       if (IncludeRegex.match(Line, &Matches)) {
-        StringRef IncludeName = getIncludeNameFromMatches(Matches);
+        StringRef IncludeName = tooling::getIncludeNameFromMatches(Matches);
         // This addresses https://github.com/llvm/llvm-project/issues/38995
         bool WithSemicolon = false;
         if (!IncludeName.startswith("\"") && !IncludeName.startswith("<") &&
@@ -3087,20 +3070,15 @@
 
 inline bool isHeaderInsertion(const tooling::Replacement &Replace) {
   return Replace.getOffset() == UINT_MAX && Replace.getLength() == 0 &&
-         llvm::Regex(CppIncludeRegexPattern)
-             .match(Replace.getReplacementText());
+         tooling::getCppIncludeRegex().match(Replace.getReplacementText());
 }
 
 inline bool isHeaderDeletion(const tooling::Replacement &Replace) {
   return Replace.getOffset() == UINT_MAX && Replace.getLength() == 1;
 }
 
-inline StringRef trimInclude(StringRef IncludeName) {
-  return IncludeName.trim("\"<>;");
-}
-
 // FIXME: insert empty lines between newly created blocks.
-tooling::Replacements
+static tooling::Replacements
 fixCppIncludeInsertions(StringRef Code, const tooling::Replacements &Replaces,
                         const FormatStyle &Style) {
   if (!Style.isCpp())
@@ -3132,7 +3110,7 @@
 
   for (const auto &Header : HeadersToDelete) {
     tooling::Replacements Replaces =
-        Includes.remove(trimInclude(Header), Header.startswith("<"));
+        Includes.remove(tooling::trimInclude(Header), Header.startswith("<"));
     for (const auto &R : Replaces) {
       auto Err = Result.add(R);
       if (Err) {
@@ -3144,7 +3122,7 @@
     }
   }
 
-  llvm::Regex IncludeRegex = llvm::Regex(CppIncludeRegexPattern);
+  llvm::Regex IncludeRegex = tooling::getCppIncludeRegex();
   llvm::SmallVector<StringRef, 4> Matches;
   for (const auto &R : HeaderInsertions) {
     auto IncludeDirective = R.getReplacementText();
@@ -3152,9 +3130,9 @@
     assert(Matched && "Header insertion replacement must have replacement text "
                       "'#include ...'");
     (void)Matched;
-    StringRef IncludeName = getIncludeNameFromMatches(Matches);
-    auto Replace =
-        Includes.insert(trimInclude(IncludeName), IncludeName.startswith("<"));
+    StringRef IncludeName = tooling::getIncludeNameFromMatches(Matches);
+    auto Replace = Includes.insert(tooling::trimInclude(IncludeName),
+                                   IncludeName.startswith("<"));
     if (Replace) {
       auto Err = Result.add(*Replace);
       if (Err) {
diff --git a/clang/lib/Tooling/Inclusions/HeaderIncludes.cpp b/clang/lib/Tooling/Inclusions/HeaderIncludes.cpp
--- a/clang/lib/Tooling/Inclusions/HeaderIncludes.cpp
+++ b/clang/lib/Tooling/Inclusions/HeaderIncludes.cpp
@@ -169,24 +169,6 @@
       });
 }
 
-inline StringRef trimInclude(StringRef IncludeName) {
-  return IncludeName.trim("\"<>;");
-}
-
-const char IncludeRegexPattern[] =
-    R"(^[\t\ ]*[@#][\t\ ]*(import|include)([^"]*("[^"]+")|[^<]*(<[^>]+>)|[\t\ ]*([^;]+;)))";
-
-// Returns the last match group in the above regex (IncludeRegexPattern) that
-// is not empty.
-StringRef getIncludeNameFromMatches(const SmallVectorImpl<StringRef> &Matches) {
-  for (int i = Matches.size() - 1; i > 0; i--) {
-    if (!Matches[i].empty())
-      return Matches[i];
-  }
-  llvm_unreachable("No non-empty match group found in list of matches");
-  return StringRef();
-}
-
 // The filename of Path excluding extension.
 // Used to match implementation with headers, this differs from sys::path::stem:
 //  - in names with multiple dots (foo.cu.cc) it terminates at the *first*
@@ -285,8 +267,7 @@
       MaxInsertOffset(MinInsertOffset +
                       getMaxHeaderInsertionOffset(
                           FileName, Code.drop_front(MinInsertOffset), Style)),
-      Categories(Style, FileName),
-      IncludeRegex(llvm::Regex(IncludeRegexPattern)) {
+      Categories(Style, FileName), IncludeRegex(getCppIncludeRegex()) {
   // Add 0 for main header and INT_MAX for headers that are not in any
   // category.
   Priorities = {0, INT_MAX};
@@ -301,7 +282,7 @@
   for (auto Line : Lines) {
     NextLineOffset = std::min(Code.size(), Offset + Line.size() + 1);
     if (IncludeRegex.match(Line, &Matches)) {
-      StringRef IncludeName = getIncludeNameFromMatches(Matches);
+      StringRef IncludeName = tooling::getIncludeNameFromMatches(Matches);
       // If this is the last line without trailing newline, we need to make
       // sure we don't delete across the file boundary.
       addExistingInclude(
@@ -415,5 +396,25 @@
   return Result;
 }
 
+llvm::Regex getCppIncludeRegex() {
+  static const char CppIncludeRegexPattern[] =
+      R"(^[\t\ ]*[@#][\t\ ]*(import|include)([^"]*("[^"]+")|[^<]*(<[^>]+>)|[\t\ ]*([^;]+;)))";
+  return llvm::Regex(CppIncludeRegexPattern);
+}
+
+llvm::StringRef getIncludeNameFromMatches(
+    const llvm::SmallVectorImpl<llvm::StringRef> &Matches) {
+  for (auto Match : llvm::reverse(Matches)) {
+    if (!Match.empty())
+      return Match;
+  }
+  llvm_unreachable("No non-empty match group found in list of matches");
+  return llvm::StringRef();
+}
+
+llvm::StringRef trimInclude(llvm::StringRef IncludeName) {
+  return IncludeName.trim("\"<>;");
+}
+
 } // namespace tooling
 } // namespace clang