Strip all non-numeric characters from string in JavaScript

The Question :

766 people think this question is useful

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.

1559 people think this answer is useful

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,'');



383 people think this answer is useful

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

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



54 people think this answer is useful

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

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



25 people think this answer is useful

You can use a RegExp to replace all the non-digit characters:

var myString = 'abc123.8<blah>';
myString = myString.replace(/[^\d]/g, ''); // 1238



22 people think this answer is useful

Something along the lines of:

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



4 people think this answer is useful

Short function to remove all non-numeric characters but keep the decimal (and return the number):

parseNum = str => +str.replace(/[^.\d]/g, '');
let str = 'a1b2c.d3e';
console.log(parseNum(str));


1 people think this answer is useful

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>



1 people think this answer is useful

Unfortunately none of the answers above worked for me.

I was looking to convert currency numbers from strings like \$123,232,122.11 (1232332122.11) or USD 123,122.892 (123122.892) or any currency like ₹ 98,79,112.50 (9879112.5) to give me a number output including the decimal pointer.

Had to make my own regex which looks something like this:

str = str.match(/\d|\./g).join('');



0 people think this answer is useful

try

myString.match(/\d/g).join



var myString = 'abc123.8<blah>'
console.log( myString.match(/\d/g).join );


-6 people think this answer is useful

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