resolve #58

Parsedown.php

@@ -825,9 +825,18 @@ class Parsedown
 
 				case '&':
 
-					$markup .= '&';
+					if (preg_match('/^&#?\w+;/', $text, $matches))
+					{
+						$markup .= $matches[0];
 
-					$offset = substr($text, 0, 5) === '&' ? 5 : 1;
+						$offset = strlen($matches[0]);
+					}
+					else
+					{
+						$markup .= '&';
+
+						$offset = 1;
+					}
 
 					break;
 

tests/data/html_entity.html

@@ -0,0 +1 @@
+<p>&amp; &copy; &#123;</p>

tests/data/html_entity.md

@@ -0,0 +1 @@
+& © {

tests/data/special_characters.html

@@ -1,5 +1,4 @@
 <p>AT&amp;T has an ampersand in their name</p>
-<p>AT&amp;T is another way to write it</p>
 <p>this &amp; that</p>
 <p>4 &lt; 5 and 6 > 5</p>
 <p><a href="http://example.com/autolink?a=1&amp;b=2">http://example.com/autolink?a=1&amp;b=2</a></p>

tests/data/special_characters.md

@@ -1,7 +1,5 @@
 AT&T has an ampersand in their name
 
-AT&T is another way to write it
-
 this & that
 
 4 < 5 and 6 > 5