javascript - Regex for diacritics

Question

I'm looking to implement the solution provided in this answer but it's not working. The code in this jsFiddle have looks like this:

function Start() {

    $('#TheBox').keyup(function () {

        var TheInput = $('#TheBox').val();      
        var TheCleanInput = TheInput.replace(/([.p{L}])/g, '');

        $('#TheBox').val(TheCleanInput);
    });
}

$(Start);

Basically, I'm looking to allow letters such as é è ? as well as numbers. What do I need to change to make the regex filter work?

Answer 1

As Casimir et Hippolyte stated in comments, Javascript does not support p{L} unicode character class.

You can create your own character class:

[a-zA-Z0-9à-?]

Demo

If you want to allow those characters but replace characters outside those ranges, negate the character classes:

[^a-zA-Z0-9à-?]

Demo

Or as pointed out in comments:

[A-zà-??-??-??-??-?ǎ-??-??-??-??-???-??-??-??-??-??-??-??-??-?]