Index: wp-includes/formatting.php
===================================================================
--- wp-includes/formatting.php	(revision 12054)
+++ wp-includes/formatting.php	(working copy)
@@ -1187,9 +1187,14 @@
 	$url = $matches[2];
 
 	$after = '';
-	if ( preg_match( '|(.+?)([).,;:]*)$|', $url, $split ) ) {
-		$url = $split[1];
-		$after = $split[2];
+	if ( 
+		$matches[0]{0} == '('
+		&& substr( $matches[0], -1 ) == ')'
+	) {
+		if ( preg_match( '|(.+?)([).,;:]*)$|', $url, $split ) ) {
+			$url = $split[1];
+			$after = $split[2];
+		}
 	}
 
 	$url = esc_url($url);