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JavaScript

var regex = /(?=^.{15,20}$)^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;

console.log("t@example.com".match(regex));
console.log("teste@example.com".match(regex));
console.log("testetesteteste@example.com".match(regex));

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JSFiddle - React, Tailwind, and code Playground

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