jQuery - 检查字符串是否包含数值

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?

Answer 1

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];
}

Answer 2

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]);
}

Answer 3

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);
    }
}());