From 04f99b387021a8ce32a8795360cba9beaf986a81 Mon Sep 17 00:00:00 2001
From: Ondřej Surý <ondrej@sury.org>
Date: Tue, 13 Sep 2011 12:00:31 +0200
Subject: Imported Upstream version 2011.09.07

---
 src/pkg/exp/regexp/syntax/regexp.go | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'src/pkg/exp/regexp/syntax/regexp.go')

diff --git a/src/pkg/exp/regexp/syntax/regexp.go b/src/pkg/exp/regexp/syntax/regexp.go
index 00a4addef..d8f51b903 100644
--- a/src/pkg/exp/regexp/syntax/regexp.go
+++ b/src/pkg/exp/regexp/syntax/regexp.go
@@ -282,3 +282,17 @@ func escape(b *bytes.Buffer, r int, force bool) {
 		b.WriteString(`}`)
 	}
 }
+
+// MaxCap walks the regexp to find the maximum capture index.
+func (re *Regexp) MaxCap() int {
+	m := 0
+	if re.Op == OpCapture {
+		m = re.Cap
+	}
+	for _, sub := range re.Sub {
+		if n := sub.MaxCap(); m < n {
+			m = n
+		}
+	}
+	return m
+}
-- 
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