+
+// These are the special characters matched in functions like "p_ere_exp".
+static const char RegexMetachars[] = "()^$|*+?.[]\\{}";
+
+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(RegexMetachars) == StringRef::npos;
+}
+
+std::string Regex::escape(StringRef String) {
+ std::string RegexStr;
+ for (unsigned i = 0, e = String.size(); i != e; ++i) {
+ if (strchr(RegexMetachars, String[i]))
+ RegexStr += '\\';
+ RegexStr += String[i];
+ }
+
+ return RegexStr;
+}