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

I believe JavaScript does not support positive lookbehind. You will have to do something more like this: script> var regex = /\#\! \/(^\/+)/; var url = "my.domain.com/index.php/#!/write-stuff/s...; var match = regex.

Exec(url); alert(match1).

I believe JavaScript does not support positive lookbehind. You will have to do something more like this.

Looks like a valid RegEx to me. I know of alternatives on how to get the segment I need, so this is really just about helping me understand what's going on here rather than getting an alternative solution.

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