There was a long post on the topic of 'regex-vs-parser' for email on reddit a while back. I hope I'm pointing to the correct person, but he wrote a parser in H

There was a long post on the topic of 'regex-vs-parser' for email on reddit a while back. I hope I'm pointing to the correct person, but he wrote a parser in Haskell that validates against RFC5322: http://hackage.haskell.org/package/email-validate http://hackage.haskell.org/package/email-validate