How do I check text box for words / symbols / phrases?

If someone uses a spam fake email domain (shark lasers) as their email address to register, I want to keep the register button still disabled.

So i want to type somewhere words, symbols and phrases to block. Where do I type this ?

http://i.imgur.com/yJg7AOk.png

This only can see it if is the ONLY thing in the box. I am still searching…

so does this…

http://i.imgur.com/PYOejtZ.png

What will search through all the text ??

This is closer but it only works if its the very first thing:

http://i.imgur.com/9kroKlx.png

Looks like i’ll do this 50 times then lol

YES ■■■■■■■

after manually trying EVERYTHING I finally got it working!

I shall share the answer for everyone since this question has never been asked before, enjoy people!

http://i.imgur.com/Gjuif4o.png