From d9e865148db83b72d535939ba38221d0675f001b Mon Sep 17 00:00:00 2001
From: Vadim Dvorovenko <Vadimon@mail.ru>
Date: Fri, 23 Jan 2015 09:49:46 +0700
Subject: [PATCH] MDL-48955 filter_mathjax: Regexp fix for
 texfiltercompatibility mode

Fixing incorrect regexp for replacing text like
"$$a$$ and $$b$$" to "\(a\) and \(b\)". This is needed for
texfiltercompatibility to work as expected.
---
 filter/mathjaxloader/filter.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/filter/mathjaxloader/filter.php b/filter/mathjaxloader/filter.php
index a22e5bf130d..a7a7b289bb8 100644
--- a/filter/mathjaxloader/filter.php
+++ b/filter/mathjaxloader/filter.php
@@ -144,7 +144,7 @@ class filter_mathjaxloader extends moodle_text_filter {
             $text = str_replace('[tex]', '\\(', $text);
             $text = str_replace('[/tex]', '\\)', $text);
             // E.g. "$$ blah $$".
-            $text = preg_replace('|\$\$[\S\s]\$\$|u', '\\(\1\\)', $text);
+            $text = preg_replace('|\$\$([\S\s]*?)\$\$|u', '\\(\1\\)', $text);
             // E.g. "\[ blah \]".
             $text = str_replace('\\[', '\\(', $text);
             $text = str_replace('\\]', '\\)', $text);