jQuery - check whether string contains numeric value

Question

How to check whether a string contains any numeric value by jquery?

I search through many examples but I only get the way to check for a number, NOT number in a STRING. I am trying to find something like $(this).attr('id').contains("number");

(p/s: my DOM id will be something like Large_a (without numeric value) , Large_a_1 (with numeric value), Large_a_2, etc.)

What method should I use?

One of the first google search results: http://stackoverflow.com/questions/3955345/javascript-jquery-get-number-from-string — Adam Tuliper, Jul 12 '11 at 06:15

score 8 · Answer 1 · answered Jul 12 '11 at 06:09

8

You could use a regular expression:

var matches = this.id.match(/\d+/g);
if (matches != null) {
    // the id attribute contains a digit
    var number = matches[0];
}

answered Jul 12 '11 at 06:09

Darin Dimitrov

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Mathieu Rodic · Accepted Answer · 2013-06-28T03:19:59.573

3

This code detects trailing digits preceded by the underscore symbol (azerty1_2 would match "2", but azerty1 would not match):

if (matches = this.id.match(/_(\d)+$/))
{
    alert(matches[1]);
}

edited Jun 28 '13 at 03:19

answered Jul 12 '11 at 06:23

Mathieu Rodic

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There's no need for grouping, *test* is likely more appropriate (*match* returns an array of matches, *test* just tests). So `if (/_\d+$/.test(this.id)) {...}`. Nice catch that the OP may only want trailing numbers. :-) – RobG Jul 12 '11 at 07:11
Sorry, I just love short code... and we never know whether the number's value will be needed or not :-) – Mathieu Rodic Jul 12 '11 at 07:16
Get it done by: if (ui.draggable.children().attr('id').match(/_(\d+)$/) != null) – shennyL Jul 12 '11 at 09:54

score 2 · Answer 3 · answered Jul 12 '11 at 07:07

2

Simple version:

function hasNumber(s) {
  return /\d/.test(s);
}

More efficient version (keep regular expression in a closure):

var hasNumber = (function() {
    var re = /\d/;
    return function(s) {
      return re.test(s);
    }
}());

answered Jul 12 '11 at 07:07

RobG

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I'm curious how much more efficient your closurised version is? I gather that the overhead of the closure is worth it to avoid recreating the regular expression every time? – nnnnnn Jul 12 '11 at 07:30

jQuery - check whether string contains numeric value

3 Answers3

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