Jquery: filter input on keypress

Question

I have a text field, which will accept only the following characters:

Allowed characters: [a-z 0-9 + # - .]

This is the same filter SO

Answer 1

You don't need to replace the char, only prevent it.

var char = String.fromCharCode(event.which)
if (!char.match(/^[^A-Za-z0-9+#\.\-]+$/)) event.preventDefault();