Introduce Regex::isLiteralERE function.
This will be used to implement an optimisation for literal entries
in special case lists.
Differential Revision: http://llvm-reviews.chandlerc.com/D1278
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187731 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Regex.cpp b/lib/Support/Regex.cpp
index efc8b90..dec967e 100644
--- a/lib/Support/Regex.cpp
+++ b/lib/Support/Regex.cpp
@@ -168,3 +168,10 @@
return Res;
}
+
+bool Regex::isLiteralERE(StringRef Str) {
+ // Check for regex metacharacters. This list was derived from our regex
+ // implementation in regcomp.c and double checked against the POSIX extended
+ // regular expression specification.
+ return Str.find_first_of("()^$|*+?.[]\\{}") == StringRef::npos;
+}