Mask an existing input value with javascript/jquery?

Question

I created a function to get the length of my input value and applying a different replace (a mask) for each one, but it's not working. Check it out:

function mask_vat(inputID) {
    var mystr = document.getElementById(inputID).value;
    var str_length = mystr.length;
    var pattern, replacement;
        switch(str_length) {
            case 14:
                pattern = '/^(\d{3}).\d{3}.\d{3}-(\d{2})$/';
                replacement = '$1.XXX.XXX-$2';
                break;
            case 18:
                pattern = '/.\d{3}.\d{3}\//';
                replacement = '.xxx.xxx/';
                break;
        }
    mystr.replace(pattern, replacement);
}

what's wrong in the function??

A nice website to test regular expression is this one : regex101.com/#javascript — Louys Patrice Bessette
– Louys Patrice Bessette, Commented Mar 26, 2017 at 5:40

Mujtaba Kably · Accepted Answer · 2017-03-26 05:35:25Z

1

In Regex . represents all character except new line. To use a . use \..

answered Mar 26, 2017 at 5:35

Mujtaba Kably

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