How can I create a regular expression that requires 4 characters and no spaces?

Question

I am trying to make the user input exactly 4 characters with no spaces... here's what I have:

.[^\s]{4}

but everything I enter says that it didn't match the regex...

Where am I going wrong?

Answer 1

Why is there an extra . in front? That will match a separate character before your "four non-spaces" get counted.

You probably also want to bind it to the beginning and end of the string, so:

^[^\s]{4}$