diff --git a/PHP Markdown Extra Readme.text b/PHP Markdown Extra Readme.text
index a1309b6a..46e348c6 100644
--- a/PHP Markdown Extra Readme.text	
+++ b/PHP Markdown Extra Readme.text	
@@ -249,6 +249,8 @@ Version History
 *	Fixed a bug where tags where the name contains an underscore aren't parsed 
 	correctly.
 
+*	Fixed some corner-cases mixing underscore-ephasis and asterisk-emphasis.
+
 
 Current Extra:
 
diff --git a/markdown.php b/markdown.php
index 19dc08c0..0efd20f3 100644
--- a/markdown.php
+++ b/markdown.php
@@ -1141,19 +1141,19 @@ function makeCodeSpan($code) {
 
 
 	var $em_relist = array(
-		''  => '(?:(?<!\*)\*(?!\*)|(?<!_)_(?!_))(?=\S)(?![.,:;]\s)',
-		'*' => '(?<=\S)(?<!\*)\*(?!\*)',
-		'_' => '(?<=\S)(?<!_)_(?!_)',
+		''  => '(?:(?<!\*)\*(?!\*)|(?<!_)_(?!_))(?=\S|$)(?![.,:;]\s)',
+		'*' => '(?<=\S|^)(?<!\*)\*(?!\*)',
+		'_' => '(?<=\S|^)(?<!_)_(?!_)',
 		);
 	var $strong_relist = array(
-		''   => '(?:(?<!\*)\*\*(?!\*)|(?<!_)__(?!_))(?=\S)(?![.,:;]\s)',
-		'**' => '(?<=\S)(?<!\*)\*\*(?!\*)',
-		'__' => '(?<=\S)(?<!_)__(?!_)',
+		''   => '(?:(?<!\*)\*\*(?!\*)|(?<!_)__(?!_))(?=\S|$)(?![.,:;]\s)',
+		'**' => '(?<=\S|^)(?<!\*)\*\*(?!\*)',
+		'__' => '(?<=\S|^)(?<!_)__(?!_)',
 		);
 	var $em_strong_relist = array(
-		''    => '(?:(?<!\*)\*\*\*(?!\*)|(?<!_)___(?!_))(?=\S)(?![.,:;]\s)',
-		'***' => '(?<=\S)(?<!\*)\*\*\*(?!\*)',
-		'___' => '(?<=\S)(?<!_)___(?!_)',
+		''    => '(?:(?<!\*)\*\*\*(?!\*)|(?<!_)___(?!_))(?=\S|$)(?![.,:;]\s)',
+		'***' => '(?<=\S|^)(?<!\*)\*\*\*(?!\*)',
+		'___' => '(?<=\S|^)(?<!_)___(?!_)',
 		);
 	var $em_strong_prepared_relist;