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Asked: 2026-06-15T15:22:43+00:00

I created this pattern in java, and now I’m trying to use it in

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I created this pattern in java, and now I’m trying to use it in javascript. Why am I getting this error? 

var pattern = /b(?=[A-Z\d]{9,10}\b)(?:[A-Z]*\d){0,2}[A-Z]*/b;

SyntaxError: invalid regular expression flag b

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1 Answer

  1. Editorial Team

    Are you trying to use “word boundaries”? That would be \b (notice the direction of the slash).

    var pattern = /\b(?=[A-Z\d]{9,10}\b)(?:[A-Z]*\d){0,2}[A-Z]*\b/;

    You also need // as delimiters.

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