diff --git a/clang/lib/Analysis/CloneDetection.cpp b/clang/lib/Analysis/CloneDetection.cpp
--- a/clang/lib/Analysis/CloneDetection.cpp
+++ b/clang/lib/Analysis/CloneDetection.cpp
@@ -153,9 +153,8 @@
 
 bool FilenamePatternConstraint::isAutoGenerated(
     const CloneDetector::CloneGroup &Group) {
-  std::string Error;
   if (IgnoredFilesPattern.empty() || Group.empty() ||
-      !IgnoredFilesRegex->isValid(Error))
+      !IgnoredFilesRegex->isValid())
     return false;
 
   for (const StmtSequence &S : Group) {
diff --git a/lldb/source/Utility/RegularExpression.cpp b/lldb/source/Utility/RegularExpression.cpp
--- a/lldb/source/Utility/RegularExpression.cpp
+++ b/lldb/source/Utility/RegularExpression.cpp
@@ -28,10 +28,7 @@
   return m_regex.match(str, matches);
 }
 
-bool RegularExpression::IsValid() const {
-  std::string discarded;
-  return m_regex.isValid(discarded);
-}
+bool RegularExpression::IsValid() const { return m_regex.isValid(); }
 
 llvm::StringRef RegularExpression::GetText() const { return m_regex_text; }
 
diff --git a/llvm/include/llvm/Support/Regex.h b/llvm/include/llvm/Support/Regex.h
--- a/llvm/include/llvm/Support/Regex.h
+++ b/llvm/include/llvm/Support/Regex.h
@@ -57,6 +57,7 @@
     /// isValid - returns the error encountered during regex compilation, or
     /// matching, if any.
     bool isValid(std::string &Error) const;
+    bool isValid() const { return !error; }
 
     /// getNumMatches - In a valid regex, return the number of parenthesized
     /// matches it contains.  The number filled in by match will include this