When I decided to learn more about regular expressions back in 2002-2003 I found a regular expression for RFC822 (with comments removed): http://www.ex-parrot.c

When I decided to learn more about regular expressions back in 2002-2003 I found a regular expression for RFC822 (with comments removed): http://www.ex-parrot.com/pdw/Mail-RFC822-Address.html http://www.ex-parrot.com/pdw/Mail-RFC822-Address.html As an exercise, I deconstructed that into the pieces it was built from. Funny times :)