Strip all non-numeric characters from string in JavaScript

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

Answer 1

we are in 2017 now you can also use ES2016

var a = 'abc123.8<blah>';
console.log([...a].filter( e => isFinite(e)).join(''));

or

console.log([...'abc123.8<blah>'].filter( e => isFinite(e)).join(''));  

The result is

1238

Answer 2

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

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

Answer 3

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

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

Answer 4

In Angular / Ionic / VueJS -- I just came up with a simple method of:

stripNaN(txt: any) {
    return txt.toString().replace(/[^a-zA-Z0-9]/g, "");
}

Usage on the view:

<a [href]="'tel:'+stripNaN(single.meta['phone'])" [innerHTML]="stripNaN(single.meta['phone'])"></a>