Prevent characters being typed

[slj90]

I use the following code to make it so users can only type a-z0-9 in the username text field. However, how would I add -_.@ to this for the email field?

var regex = new RegExp("^[a-zA-Z0-9]+$");

Thanks

[Tom10]

I use the following code to make it so users can only type a-z0-9 in the username text field. However, how would I add -_.@ to this for the email field?

var regex = new RegExp("^[a-zA-Z0-9]+$");

Thanks

Would it not be easier to use html and include the readonly attribute?

[requinix]

So your question is not about preventing people from typing, nor about how to prevent people from typing certain characters, but about how to add a couple more to the set of allowed characters?

 

Hyphen has a special meaning in character sets that goes away when you put it at the beginning or end (or a third way). The other three don't.

var regex = new RegExp("^[a-zA-Z0-9_.@-]+$");