numeric/string to only numeric

Question

In Javascript, how transform a "numeric/string" variable to only numeric? Using some function or regular expression.?

Sample: Input: 11.489.301/0001-47 to: 11489301000147

Answer 1

Use replace() to remove any non-numeric characters, and Number() to convert the string type to a number type:

var num = Number("11.489.301/0001-47".replace(/\D/g, ""));

alert(num);
//-> 11489301000147

Answer 2

If you mean to just remove everything that is not digits from a string you can use a regular expression:

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

If you then want to turn the string it into a numeric value, you can parse it:

var n = parseInt(s,10);