Javascript/RegExp: Lookbehind Assertion is causing a “Invalid group” error

Question

I\'m doing a simple Lookbehind Assertion to get a segment of the URL (example below) but instead of getting the match I get the following error:

Uncaught Syn         


        

Answer 1

Javascript doesn't support look-behind syntax, so the (?<=) is what's causing the invalidity error. However, you can mimick it with various techniques: http://blog.stevenlevithan.com/archives/mimic-lookbehind-javascript