jQuery / Get numbers from a string

Question

I have a button on my page with a class of comment_like and an ID like comment_like_123456 but the numbers at the end are variable; could be 1 to 1

Answer 1

http://jsfiddle.net/hj2nJ/

var x = 'comment_like_6846511';
var y = '';

for (i = 0; i < x.length; i++)
{
    if ("" + parseInt(x[i]) != "NaN") //if the character is a number
        y = y + x[i];
}

document.write(y);