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Home/ Questions/Q 7073745
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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T05:58:00+00:00 2026-05-28T05:58:00+00:00

I need help to built regular expression for string which does not start with

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I need help to built regular expression for

string which does not start with pcm_ or PCM_

any guess!!!

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  1. Editorial Team
    Editorial Team
    2026-05-28T05:58:00+00:00Added an answer on May 28, 2026 at 5:58 am

    The regex solution would be

    ^(?i)(?!pcm_)
    

    (?i) is the inline version of RegexOptions.IgnoreCase

    ^ matches the start of the string

    (?!pcm_) is a negative lookahead assertion, that is true if the string does not start with “pcm_” or “PCM_” (but also “PcM_, …)

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