Question

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?

Answer 1

You could use a lookahead assertion:

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