Strip all non-numeric characters from string in JavaScript

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,'');

If you need this to leave the dot for float numbers, use this

var s = "-12345.50 €".replace(/[^\d.-]/g, ''); // gives "-12345.50"

Use a regular expression, if your script implementation supports them. Something like:

myString.replace(/[^0-9]/g, '');