Nothing like a dive into the wondrous world of what is and isn't allowed in an email address left of the @ on a warm late-summer morning. It's one of the myster

Nothing like a dive into the wondrous world of what is and isn't allowed in an email address left of the @ on a warm late-summer morning. It's one of the mysteries of the modern world. The simple heuristic that proposes that every regex trying to express "valid email address" is wrong is a sufficiently safe bet, but it ruins all the fun.