Question

Consider a non-DOM scenario where you’d want to remove all non-numeric characters from a string using JavaScript/ECMAScript. Any characters that are in range 0 - 9 should be kept.

var myString = 'abc123.8<blah>';

//desired output is 1238

How would you achieve this in plain JavaScript? Please remember this is a non-DOM scenario, so jQuery and other solutions involving browser and keypress events aren’t suitable.

Answer 1

Use the string’s .replace method with a regex of \D, which is a shorthand character class that matches all non-digits:

myString = myString.replace(/\D/g,'');