From f75af8c1464e948b5e166cf5ab09ebf0d82fc253 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Mon, 27 Jul 2020 22:27:54 -0700
Subject: libgo: update to go1.15rc1

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/245157
---
 libgo/go/regexp/regexp.go | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'libgo/go/regexp/regexp.go')

diff --git a/libgo/go/regexp/regexp.go b/libgo/go/regexp/regexp.go
index 19ca6f2..b547a2a 100644
--- a/libgo/go/regexp/regexp.go
+++ b/libgo/go/regexp/regexp.go
@@ -345,6 +345,24 @@ func (re *Regexp) SubexpNames() []string {
 	return re.subexpNames
 }
 
+// SubexpIndex returns the index of the first subexpression with the given name,
+// or -1 if there is no subexpression with that name.
+//
+// Note that multiple subexpressions can be written using the same name, as in
+// (?P<bob>a+)(?P<bob>b+), which declares two subexpressions named "bob".
+// In this case, SubexpIndex returns the index of the leftmost such subexpression
+// in the regular expression.
+func (re *Regexp) SubexpIndex(name string) int {
+	if name != "" {
+		for i, s := range re.subexpNames {
+			if name == s {
+				return i
+			}
+		}
+	}
+	return -1
+}
+
 const endOfText rune = -1
 
 // input abstracts different representations of the input text. It provides
-- 
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