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Home/ Questions/Q 747853
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Editorial Team
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Editorial Team
Asked: May 14, 20262026-05-14T14:15:11+00:00 2026-05-14T14:15:11+00:00

Is there any way to find which input character fails the regex pattern .

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Is there any way to find which input character fails the regex pattern.

For ex: consider [A-Za-z\s.&] is only allowable but the user enter like “test/string” where ‘/’ invalidates input. How to find who fails regex (our case ‘/’)

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  1. Editorial Team
    Editorial Team
    2026-05-14T14:15:11+00:00Added an answer on May 14, 2026 at 2:15 pm

    You could remove the valid chars and you’ll have a string of the invalid ones:

    var invalid = "test/string".replace(/[A-Za-z\s.&]/g,""); // results in "/"
    
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