updated regex to match essid containing - and !

[6661620a]

AVMs Fritz!Box comes with "!" character in its essid by default. I saw some of those and others containing "-". Updated the regex to include those names

[staz0t]

Hey, I just noticed an error in your regex and also in my current regex. In my current regex I didn't have to add single quotes for the space. And in your regex, you've added '-' which in regex means any character between the charset ' and '. Which means that you've add a single quote to the regex.

So I've requested for changes

[6661620a]

The correct regex will be [-a-zA-Z0-9_ !]+

that was it :-) now it works as expected for me

[staz0t]

Thanks for contributing!