From c2616e726dbd4364c9a79ed0811df081dd52e0c9 Mon Sep 17 00:00:00 2001
From: Colin O'Dell <colinodell@gmail.com>
Date: Wed, 15 Mar 2017 20:22:26 -0400
Subject: [PATCH 1/3] Only autolink if href pmeets CommonMark spec

---
 src/Converter/LinkConverter.php | 12 +++++++++++-
 tests/HtmlConverterTest.php     |  6 ++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/Converter/LinkConverter.php b/src/Converter/LinkConverter.php
index d2f6da0..f0765f3 100644
--- a/src/Converter/LinkConverter.php
+++ b/src/Converter/LinkConverter.php
@@ -19,7 +19,7 @@ public function convert(ElementInterface $element)
 
         if ($title !== '') {
             $markdown = '[' . $text . '](' . $href . ' "' . $title . '")';
-        } elseif ($href === $text) {
+        } elseif ($href === $text && $this->isValidAutolink($href)) {
             $markdown = '<' . $href . '>';
         } else {
             $markdown = '[' . $text . '](' . $href . ')';
@@ -39,4 +39,14 @@ public function getSupportedTags()
     {
         return array('a');
     }
+
+    /**
+     * @param string $href
+     *
+     * @return bool
+     */
+    private function isValidAutolink($href)
+    {
+        return preg_match('/^[A-Za-z][A-Za-z0-9.+-]{1,31}:[^<>\x00-\x20]*/i', $href) === 1;
+    }
 }
diff --git a/tests/HtmlConverterTest.php b/tests/HtmlConverterTest.php
index 14be360..e7cc82a 100644
--- a/tests/HtmlConverterTest.php
+++ b/tests/HtmlConverterTest.php
@@ -107,6 +107,12 @@ public function test_anchor()
         $this->html_gives_markdown('<a href="">Test</a>', '<a href="">Test</a>');
         $this->html_gives_markdown('<a href="#nerd" title="Title">Test</a>', '[Test](#nerd "Title")');
         $this->html_gives_markdown('<a href="#nerd">Test</a>', '[Test](#nerd)');
+
+        // Autolinking
+        $this->html_gives_markdown('<a href="test">test</a>', '[test](test)');
+        $this->html_gives_markdown('<a href="google.com">google.com</a>', '[google.com](google.com)');
+        $this->html_gives_markdown('<a href="https://www.google.com">https://www.google.com</a>', '<https://www.google.com>');
+        $this->html_gives_markdown('<a href="ftp://files.example.com">ftp://files.example.com</a>', '<ftp://files.example.com>');
     }
 
     public function test_horizontal_rule()

From 7795675df3044e2697f39a1cc8963cd8b1b82b44 Mon Sep 17 00:00:00 2001
From: Colin O'Dell <colinodell@gmail.com>
Date: Wed, 15 Mar 2017 20:25:53 -0400
Subject: [PATCH 2/3] Update CHANGELOG in preparation for 4.4.1 release

---
 CHANGELOG.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 453cde8..55d5b97 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@ Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) princip
 
 ## [Unreleased][unreleased]
 
+## [4.4.1]
+
+### Fixed
+ - Fixed autolinking of invalid URLs (#129)
+
 ## [4.4.0]
 
 ### Added

From df5fbfe780abaaf84a618673ee7ae43c8e52fabf Mon Sep 17 00:00:00 2001
From: Colin O'Dell <colinodell@gmail.com>
Date: Wed, 15 Mar 2017 20:34:32 -0400
Subject: [PATCH 3/3] Fix missing link

---
 CHANGELOG.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 55d5b97..0678644 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -188,7 +188,8 @@ not ideally set, so this releases fixes that. Moving forwards this should reduce
 ### Added
  - Initial release
 
-[unreleased]: https://github.com/thephpleague/html-to-markdown/compare/4.4.0...master
+[unreleased]: https://github.com/thephpleague/html-to-markdown/compare/4.4.1...master
+[4.4.1]: https://github.com/thephpleague/html-to-markdown/compare/4.4.0...4.4.1
 [4.4.0]: https://github.com/thephpleague/html-to-markdown/compare/4.3.1...4.4.0
 [4.3.1]: https://github.com/thephpleague/html-to-markdown/compare/4.3.0...4.3.1
 [4.3.0]: https://github.com/thephpleague/html-to-markdown/compare/4.2.2...4.3.0