From d0977b26a3c4cdeeca8ff5811c7a3e3725bd32e5 Mon Sep 17 00:00:00 2001
From: Aaron Schulz <aaron@users.mediawiki.org>
Date: Thu, 18 Nov 2010 00:25:58 +0000
Subject: [PATCH] (bug 25920) Moved forward ref to a nested ref to really get
 v6 regex to compile on older PCRE versions

---
 includes/IP.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/includes/IP.php b/includes/IP.php
index 9aeba39f2c..356c770ce4 100644
--- a/includes/IP.php
+++ b/includes/IP.php
@@ -42,7 +42,7 @@ define( 'RE_IPV6_ADD',
 	'|' . // has no "::"
 		RE_IPV6_WORD . '(?::' . RE_IPV6_WORD . '){7}' .
 	'|' . // contains one "::" in the middle (awkward regex for PCRE 4.0+ compatibility)
-		RE_IPV6_WORD . '(?::(?!(?P=abn))(?P<abn>:(?P<iabn>))?' . RE_IPV6_WORD . '){1,6}(?P=iabn)' .
+		RE_IPV6_WORD . '(?::(?P<abn>(?!(?P=abn)):(?P<iabn>))?' . RE_IPV6_WORD . '){1,6}(?P=iabn)' .
 		// NOTE: (?!(?P=abn)) fails iff "::" used twice; (?P=iabn) passes iff a "::" was found.
 		
 		// Better regexp (PCRE 7.2+ only), allows intuitive regex concatenation
-- 
2.20.1