From 66bbae73a9442d08088d8bb8a6e4940266aed526 Mon Sep 17 00:00:00 2001
From: "Edward Z. Yang" <ezyang@cs.stanford.edu>
Date: Mon, 6 Mar 2017 23:27:30 -0800
Subject: [PATCH] Comment on why it's a non-greedy match.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
---
 library/HTMLPurifier/Filter/ExtractStyleBlocks.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/library/HTMLPurifier/Filter/ExtractStyleBlocks.php b/library/HTMLPurifier/Filter/ExtractStyleBlocks.php
index 8d781946..66f70b0f 100644
--- a/library/HTMLPurifier/Filter/ExtractStyleBlocks.php
+++ b/library/HTMLPurifier/Filter/ExtractStyleBlocks.php
@@ -95,6 +95,9 @@ class HTMLPurifier_Filter_ExtractStyleBlocks extends HTMLPurifier_Filter
         if ($tidy !== null) {
             $this->_tidy = $tidy;
         }
+        // NB: this must be NON-greedy because if we have
+        // <style>foo</style>  <style>bar</style>
+        // we must not grab foo</style>  <style>bar
         $html = preg_replace_callback('#<style(?:\s.*)?>(.*)<\/style>#isU', array($this, 'styleCallback'), $html);
         $style_blocks = $this->_styleMatches;
         $this->_styleMatches = array(); // reset
-- 
2.11.4.GIT