bytes, strings: IndexOfAny

+ first use in go/doc

R=r
CC=golang-dev
http://codereview.appspot.com/781041

1 files changed, 2 insertions, 9 deletions

diff --git a/src/pkg/go/doc/doc.go b/src/pkg/go/doc/doc.go
index 5ff3eafa6..d7e404f14 100644
--- a/src/pkg/go/doc/doc.go
+++ b/src/pkg/go/doc/doc.go
@@ -10,6 +10,7 @@ import (
 	"go/ast"
 	"go/token"
 	"regexp"
+	"strings"
 	"sort"
 )
 
@@ -564,15 +565,7 @@ func (doc *docReader) newDoc(importpath string, filenames []string) *PackageDoc
 
 // Does s look like a regular expression?
 func isRegexp(s string) bool {
-	metachars := ".(|)*+?^$[]"
-	for _, c := range s {
-		for _, m := range metachars {
-			if c == m {
-				return true
-			}
-		}
-	}
-	return false
+	return strings.IndexAny(s, ".(|)*+?^$[]") >= 0
 }