Regex Replace anything but numbers and lowercase

Question

I have an input which I am binding to keyup()

On each keyup, I want it to:

1. disallow any characters that are not a number, a letter, or a dash, and

Answer 1

Good question.. you're almost there!

$('.my-input').keyup(function() { this.value = this.value.replace(/[^A-Za-z0-9-]/g,"").toLowerCase();

Regex is not the right tool for lowercasing, use the built-in function. Your regex was good, but the replace function takes one regex and the replacement is a string, not a regex*.

(*replacement strings have some minor magic, but not enough for lowercasing)