diff --git a/lib/less/browser.js b/lib/less/browser.js
index 8a277360..243681b1 100644
--- a/lib/less/browser.js
+++ b/lib/less/browser.js
@@ -79,7 +79,7 @@ function createCSS(styles, sheet, lastModified) {
     css.title = 'less-sheet';
 
     if (sheet) {
-        css.title = sheet.title || sheet.href.match(/(^|\/)([-\w]+)\.[a-z]+$/i)[1];
+        css.title = sheet.title || sheet.href.match(/(?:^|\/)([-\w]+)\.[a-z]+$/i)[1];
 
         // Don't update the local store if the file wasn't modified
         if (lastModified && typeof(localStorage) !== "undefined") {