I'm new to regex and not sure how each part of the below breaks down to testing for email, especially the ! at beginning and the ._%+0-
!/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i.test(values.email)
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stackjlei
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2The first `!` character is JavaScript's _NOT_ operator. – Ruslan Osmanov Oct 17 '16 at 09:46
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2plot it into [http://regexr.com/](http://regexr.com/) and open the explain tab in the bottom of the page. – Emil S. Jørgensen Oct 17 '16 at 09:47
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See https://regex101.com/r/bgURzi/1 – Wiktor Stribiżew Oct 17 '16 at 09:57