Index: includes/EditPage.php
===================================================================
--- includes/EditPage.php	(revision 104205)
+++ includes/EditPage.php	(working copy)
@@ -1717,10 +1717,10 @@
 				return false;
 			}
 
    		if ( $this->section != '' && $this->section != 'new' ) {
 				$matches = array();
 				if ( !$this->summary && !$this->preview && !$this->diff ) {
-					preg_match( "/^(=+)(.+)\\1/mi", $this->textbox1, $matches );
+					preg_match( "/^(=+)(.+)\\1/si", $this->textbox1, $matches );
 					if ( !empty( $matches[2] ) ) {
 						global $wgParser;
 						$this->summary = "/* " .