Extract a number from a string (JavaScript)

Question

I have a string in JavaScript like #box2 and I just want the 2 from it.

I tried:

var thestring = $(this).attr(\'href\');
var          


        

Answer 1

Tried all the combinations cited above with this Code and got it working, was the only one that worked on that string -> (12) 3456-7890

var str="(12) 3456-7890";
str.replace( /\D+/g, '');

Result: "1234567890"

Obs: i know that a string like that will not be on the attr but whatever, the solution is better, because its more complete.

Answer 2

you may use great parseInt method

it will convert the leading digits to a number

parseInt("-10px");
// will give you -10

Answer 3

I think this regular expression will serve your purpose:

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

Where txt is your string.

It basically rips off anything that is not a digit.

I think you can achieve the same thing by using this as well :

var num = txt.replace(/\D/g,'');

Answer 4

Using match function.

var thenum = thestring.match(/\d+$/)[0];
alert(thenum);

jsfiddle

Answer 5

And this is a snippet which extracts prices with currency and formatting:

var price = "£1,739.12";
parseFloat(price.replace( /[^\d\.]*/g, '')); // 1739.12

Answer 6

Use this one-line code to get the first number in a string without getting errors:

var myInt = parseInt(myString.replace(/^[^0-9]+/, ''), 10);