How to do email input validation with JS and RegExp?

Question

JavaScript

Comrades!
I can't figure out how to validate text input in a field. It doesn't even matter if it's mail or any other format (date, for example). I'm dumb and everything.
I want the background to be green with correct input, and with incorrect input, it will change to red and the incorrectly entered character will be deleted.
https://codepen.io/guvijur/pen/ExVEoYX

PS It dawned on me. It happens that you will rest against the horn and not in any. ).
I, the fool, compared the string with the regular expression, but it was necessary to compare the specifically entered character.
It's a shame. I fixed everything in the codepen, now it works fine there.

Answer 1

Unless it remains to allow input only in Latin characters.