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Asked: 2026-05-26T20:36:24+00:00

I am attempting to create a regex that will match all uppercase letters before

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I am attempting to create a regex that will match all uppercase letters before the first question mark in a URL string:

/foO/baR/?_heLLo=1320957051041105000&_woRld=0

I have tried both the following:

(?<!(\?))([A-Z])
(?<!\?.*?)([A-Z])

The former captures uppercase letters before and after the question mark. The latter captures no uppercase letters. Any insight would be appreciated, thanks.

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1 Answer

  1. Editorial Team

    Try this positive lookbehind:

    (?<=^[^?]*)[A-Z]
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