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Asked: 2026-05-11T03:08:12+00:00

I want to write a regex that matches if a string contains XYZ but

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I want to write a regex that matches if a string contains XYZ but doesn’t contain ABC somewhere before it. So ‘blah XYZ blah’ should match, but ‘blah ABC blah XYZ blah ‘ should not.

Any ideas? In particular I’m writing the regex in c#, in case there’s anything specific to that syntax.

I guess I can use negative lookbehind but haven’t used this before…

thanks!

UPDATE: I need a regex as I don’t have the ability to modify the code, just some configuration.

UPDATE: Changed as I actually only need to check that ABC doesn’t appear before XYZ, I don’t need to check if it comes after.

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1 Answer

  1. No need for lookbehind:

    ^(?:(?!ABC).)*XYZ
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