Question

180

Format number using regex in javascript

rated 0 times [ 184] [ 4] / answers: 1 / hits: 16719 / 12 Years ago, wed, january 9, 2013, 12:00:00

I am attempting to implement an auto-formatter in JS, such that if I have a given value (e.g. 12345678) and I have a given format (e.g. XX.XX.XX OR XX-XX-XX OR XX/XX/XX OR XXX-XXXX), I can auto-format my initial value to any of the given formats.

The required format will vary, so it needs to be able to take any given format and reformat the original value to match.

I have no idea if its possible or how to go about it. Any help appreciated.

Thanks,

Clara

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havenbilliec

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answered 12 Years ago erinh · Accepted Answer

Something like this ?

function format(mask, number) {

   var s = ''+number, r = '';

   for (var im=0, is = 0; im<mask.length && is<s.length; im++) {

     r += mask.charAt(im)=='X' ? s.charAt(is++) : mask.charAt(im);

   }

   return r;

}    



console.log(format('XX.XX.XX', 12345678)); // logs 12.34.56 

console.log(format('XXX-XXXX', 12345678)); // logs 123-4567

console.log(format('XX-XX-XX', 12345678)); // logs 12-34-56 

console.log(format('XX/XX/XX', 12345678)); // logs 12/34/56

console.log(format('XX/XX/XX/XX/XX', 12345678)); // logs 12/34/56/78

No regex engine was harmed in the making of this code.

Fiddle