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

this.value = this.value.toLowerCase().replace(/[^0-9a-z-]/g,"");

Answer 2

$('.my-input').keyup(function() {
    this.value = this.value.replace(/[^0-9a-zA-Z-]/g, '').toLowerCase();
});

Answer 3

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)

Answer 4

The regex for a number, letter or dash is: [-0-9a-z] (to include a literal dash in your character class, specify it as the first character; thereafter it's considered a range operator).

Try:

$('.my-input').keyup(function() {this.value = this.value.toLowerCase().replace(/[^-0-9a-z]/g,''); });