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Custom input sequence


I am trying to make an input validation but it seems I am missing something.
As a Delphi programmer, it was easy but… here … I can not find a tool that would let me
validate an input field.

What I am trying to accomplish is this:
When a user inputs email and the password, I want him to choose a word.
If email, password, and word are correctly validated then he can sign up.

The input “word” needs to be comprised of letters; no numbers, no spaces, no other characters.

How do I do this ?

Thank you!