Special character check in visibility conditions

[absolutenathan]

I’m making an app that uses a username system. The users can’t use any special characters with the exception of _ or -. That includes spaces too. How would I be able to check that a user doesn’t have those on the “change username” screen to show the button to finalize their username?

[Uzo]

Try this:

 var regex = /^[a-zA-Z0-9-_]+$/;
 return regex.test(p1);