how to get numeric value from string?

Question

This will alert 23.

alert(parseInt(\'23 asdf\'));

But this will not alert 23 but alerts NaN

alert(parseInt(\'asdf 23\'));
         


        

Answer 1

You have to use regular expression to extract the number.

var mixedTextAndNumber= 'some56number';
var justTheNumber = parseInt(mixedTextAndNumber.match(/\d+/g));