Index: llvm/trunk/include/llvm/Support/Regex.h
===================================================================
--- llvm/trunk/include/llvm/Support/Regex.h
+++ llvm/trunk/include/llvm/Support/Regex.h
@@ -60,6 +60,7 @@
     /// 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