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Home/ Questions/Q 67143
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Asked: May 10, 20262026-05-10T19:12:49+00:00 2026-05-10T19:12:49+00:00

Looking for a bit of regex help. I’d like to design an expression that

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Looking for a bit of regex help. I’d like to design an expression that matches a string with ‘foo‘ OR ‘bar‘, but not both ‘foo‘ AND ‘bar‘

If I do something like…

/((foo)|(bar))/ 

It’ll match ‘foobar‘. Not what I’m looking for. So, how can I make regex match only when one term or the other is present?

Thanks!

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  1. 2026-05-10T19:12:50+00:00Added an answer on May 10, 2026 at 7:12 pm

    You can do this with a single regex but I suggest for the sake of readability you do something like…

    (/foo/ and not /bar/) || (/bar/ and not /foo/) 
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