From accd4a1b65e40cd307d25f3495371126869b583b Mon Sep 17 00:00:00 2001
From: Jermolene <jeremy@jermolene.com>
Date: Mon, 17 Oct 2016 19:08:01 +0100
Subject: [PATCH] Fix regexp performance problem introduced in
 c7b31b02422265e11b68992e58ef5638cf2e568e

This fixes a problem introduced in
c7b31b02422265e11b68992e58ef5638cf2e568e.

The changes by @tobibeer inadvertently made the regular expression
evaluation significantly more expensive because of lookahead. The is
less elegant but reverts the performance problem.
---
 core/modules/parsers/wikiparser/rules/syslink.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/core/modules/parsers/wikiparser/rules/syslink.js b/core/modules/parsers/wikiparser/rules/syslink.js
index 5189ee82d..6eb2cdcd4 100644
--- a/core/modules/parsers/wikiparser/rules/syslink.js
+++ b/core/modules/parsers/wikiparser/rules/syslink.js
@@ -19,9 +19,9 @@ exports.init = function(parser) {
 	this.parser = parser;
 	// Regexp to match
 	this.matchRegExp = new RegExp(
-		"~?\\$:\\/(?:" +
-			$tw.config.textPrimitives.anyLetter +
-			"|[\/._-])+",
+		"~?\\$:\\/[" +
+		$tw.config.textPrimitives.anyLetter.substr(1,$tw.config.textPrimitives.anyLetter.length - 2) +
+		"\/._-]+",
 		"mg"
 	);
 };