a/20139649/1636522

by wared

CSS

*{font-family:Consolas}

JavaScript

output('hasDigit(\'1\')' + new Array(6).join(' ') + hasDigit('1'));
output('hasDigit(\',,\')' + new Array(5).join(' ') + hasDigit(',,'));
output('hasDigit(\'1,2,0\') ' + hasDigit('1,2,0'));

function hasDigit(v) {
    return /\d/.test(v);
}

function output(s) {
    document.body.innerHTML += s + '<br/>';
}