[C++] Implement findstring, filter, and filter-out
diff --git a/strutil.h b/strutil.h
index b7d1147..66224e7 100644
--- a/strutil.h
+++ b/strutil.h
@@ -72,6 +72,8 @@
 void AppendSubstRef(StringPiece str, StringPiece pat, StringPiece subst,
                     string* out);
 
+bool MatchPattern(StringPiece str, StringPiece pat);
+
 string NoLineBreak(const string& s);
 
 StringPiece TrimLeftSpace(StringPiece s);