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Editorial Team
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Asked: 2026-05-13T13:35:47+00:00

I am using the LiveValidation library found at www.livevalidation.com to handle client-side validation. One

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I am using the LiveValidation library found at http://www.livevalidation.com to handle client-side validation. One of the functions is to test for a regular expression. The example they provide on the site is to check if the phrase ‘live’ is within the a sentence. The code for that is:

var f2 = new LiveValidation('f2');
f2.add( Validate.Format, { pattern: /live/i } );

What would the regular expression be if I wanted to ensure that what was entered was between 7 and 16 characters and containted at least 1 numeric?

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1 Answer

  1. Editorial Team

    You could use a lookahead assertion:

    /^(?=.{7,16}$)\D*\d/
/^(?=\D*\d).{7,16}$/
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