Formerly email validation What is the correct Validation Pattern format to add to a Formerly email field in the Craft admin control panel if I want to stop any submissions from email addresses with a .ru TLD?

I've tried:

!(\.ru)
/^((?!\.ru).)*$/s


But they do nothing.
Try find the regex string in https://regex101.com/ where you can define your pos and neg examples.

.*(?:(?!ru).).$ 

See https://stackoverflow.com/questions/16398471/regex-for-string-not-ending-with-given-suffix