From a696e508ad5d3566b447fc48f355e91953a17c4a Mon Sep 17 00:00:00 2001
From: Alain Schlesser <alain.schlesser@gmail.com>
Date: Fri, 26 Oct 2018 00:08:06 +0200
Subject: [PATCH] Fix usage of `preg_quote()` (#10998)

The end tag pattern is currently generated like this:
```
$end_tag_pattern = '/<!--\s+\/wp:' . str_replace( '/', '\/', preg_quote( $block_name ) ) . '\s+-->/';
```

Instead of separately using a string replace to replace `/` with `\/`, it is preferable to use the second argument `$delimiter` that the `preg_quote()` function provides.

See http://php.net/manual/en/function.preg-quote.php
---
 lib/blocks.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/blocks.php b/lib/blocks.php
index a08ce4818465d..6ef34c4176eef 100644
--- a/lib/blocks.php
+++ b/lib/blocks.php
@@ -232,7 +232,7 @@ function do_blocks( $content ) {
 			$inner_content = '';
 
 			if ( ! $is_self_closing ) {
-				$end_tag_pattern = '/<!--\s+\/wp:' . str_replace( '/', '\/', preg_quote( $block_name ) ) . '\s+-->/';
+				$end_tag_pattern = '/<!--\s+\/wp:' . preg_quote( $block_name, '/' ) . '\s+-->/';
 				if ( ! preg_match( $end_tag_pattern, $content, $block_match_end, PREG_OFFSET_CAPTURE ) ) {
 					// If no closing tag is found, abort all matching, and continue
 					// to append remainder of content to rendered output.