email_address_validator

So to sum up the comments on the previous submission: 1) Someone did make a fully compliant Regex https://github.com/larb/email_address_validator 2) Lots of people (including the author http://news.ycombinator.com/item?id=4486264) think that you should at least validate that the '@' is somewhere to avoid username / email mixups 3) If your regex fails for foo+tag@something.com lots of people get pissed. I learned you can use that for inbox sorting since foo+tag@something.com goes to foo@something.com. 4) There are other schools of thought that promote validation and telling the user something is wrong like mailcheck.js (https://github.com/Kicksend/mailcheck), but these should not stop users from submitting forms. Did I miss anything?

A couple years ago Evan Phoenix (of rubinius) and I collaborated (by which I mean he wrote the grammar and I did almost nothing) on a REAL RFC compliant email address validator using a PEG for parsing: https://github.com/larb/email_address_validator I don't know that anyone uses it, or would even want to use it. It was a fun project, but I certainly wouldn't use it in an app (unless it was an MTA or MUA). What comprises a valid email address is way too broad. I think there are reasonable regexes for email addresses FWIW. The RFC(s) are stupid and broken, and you can hit 99.99999% of addrs and provide useful errors back to the users with a regex.