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Home/ Questions/Q 619831
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T18:41:51+00:00 2026-05-13T18:41:51+00:00

i dont undestand the () in regexp. eg. what is the difference between these

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i dont undestand the () in regexp.

eg. what is the difference between these lines:

"/hello/"
"/(hello)/"
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  1. Editorial Team
    Editorial Team
    2026-05-13T18:41:51+00:00Added an answer on May 13, 2026 at 6:41 pm

    By wrapping it in ( and ) you can capture it and handle it as a whole. Suppose we have the following text:

    hellohello hello!

    If I wanted to find the word “hello” in two’s, I could do this:

    /hellohello/
    

    Or, I could do this:

    /(hello){2}/
    
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