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Home/ Questions/Q 7599401
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Editorial Team
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Editorial Team
Asked: May 30, 20262026-05-30T22:39:07+00:00 2026-05-30T22:39:07+00:00

I have to match groups of strings that have as bounds the __ char

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I have to match groups of strings that have as bounds the “__” char sequence (two underscores)

for instance:

hello __1the_re__ my name is __pe er33__

“1the_re” and “pe er33” should be matched

my problem is defining “a string that doesn’t contain a sequence of characters”

/__((?!__).*)__/

Ive tried this, but it is not working…

thank you!

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  1. Editorial Team
    Editorial Team
    2026-05-30T22:39:09+00:00Added an answer on May 30, 2026 at 10:39 pm

    You’re close:

    /__((?!__).)*__/
    

    works. The star must be outside the repeated group so the lookahead is performed at every position, not just right after the leading __.

    Since this doesn’t capture the right text (I’m guessing that you want the content between the double underscores to be captured), you probably want

    /__((?:(?!__).)*)__/
    
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