diff --git a/svr.js b/svr.js
index fb03005..cb70654 100644
--- a/svr.js
+++ b/svr.js
@@ -543,7 +543,7 @@ function getOS() {
 
 function createRegex(regex, isPath) {
   var regexStrMatch = regex.match(/^\/((?:\\.|[^\/\\])*)\/([a-zA-Z0-9]*)$/);
-  if (!regexStrMatch) throw new Error("Invalid regex!");
+  if (!regexStrMatch) throw new Error("Invalid regular expression: " + regex);
   var searchString = regexStrMatch[1];
   var modifiers = regexStrMatch[2];
   if (isPath && !modifiers.match(/i/i) && os.platform() == "win32") modifiers += "i";