# is a valid character in an email address. Regexes are a horrible idea to validate or parse emails and have been since the beginning. Most regexes will be too

# is a valid character in an email address. Regexes are a horrible idea to validate or parse emails and have been since the beginning. Most regexes will be too strict. The reason people use regexes on the client side is they copy pasta something they find on the internet. Incidentally, a great way to get emails delivered is to properly validate them. Sure typos are possible... Few things are a worse user experience than having a valid email rejected by a client side parser.