From 5a563008aa2b63161363fc3abe0e1b3345f1299a Mon Sep 17 00:00:00 2001
From: Emanuil Rusev <hello@erusev.com>
Date: Thu, 21 Nov 2013 13:39:00 +0200
Subject: [PATCH] implement GFM strikethrough

---
 Parsedown.php                 | 5 +++++
 tests/data/strikethrough.html | 3 +++
 tests/data/strikethrough.md   | 5 +++++
 3 files changed, 13 insertions(+)
 create mode 100644 tests/data/strikethrough.html
 create mode 100644 tests/data/strikethrough.md

diff --git a/Parsedown.php b/Parsedown.php
index c84ae75..e4c2ad3 100755
--- a/Parsedown.php
+++ b/Parsedown.php
@@ -766,6 +766,11 @@ class Parsedown
 
 		# ~
 
+		if (strpos($text, '~~') !== FALSE)
+		{
+			$text = preg_replace('/~~(?=\S)(.+?)(?<=\S)~~/s', '<del>$1</del>', $text);
+		}
+
 		if (strpos($text, '_') !== FALSE)
 		{
 			$text = preg_replace('/__(?=\S)(.+?)(?<=\S)__(?!_)/s', '<strong>$1</strong>', $text);
diff --git a/tests/data/strikethrough.html b/tests/data/strikethrough.html
new file mode 100644
index 0000000..bdcdc41
--- /dev/null
+++ b/tests/data/strikethrough.html
@@ -0,0 +1,3 @@
+<p><del>strikethrough</del></p>
+<p>in the <del>middle</del> of a sentence</p>
+<p>in the middle of a w<del>or</del>d</p>
\ No newline at end of file
diff --git a/tests/data/strikethrough.md b/tests/data/strikethrough.md
new file mode 100644
index 0000000..6c7efaf
--- /dev/null
+++ b/tests/data/strikethrough.md
@@ -0,0 +1,5 @@
+~~strikethrough~~
+
+in the ~~middle~~ of a sentence
+
+in the middle of a w~~or~~d
\ No newline at end of file