How do I remove unwanted inputs from a string?

How do I...?
#1

Hello!

I am looking for a way to remove any symbols from a string, ie, if someone types ‘rockst@r’ I want to remove the @ (or anything that is not a letter or a number).

Is there a straightforward way to do this?

Thank you in advance!

#2

The current string manipulation actions and expressions don’t have string replacement. I would create a new extension with a single line or two of JavaScript to accomplish this, but I recognize that’s not in everyone’s abilities.