Lots of programmers try to write regular expressions to validate e-mail addresses, but it's extremely difficult for them to get it right, because valid e-mail a

Lots of programmers try to write regular expressions to validate e-mail addresses, but it's extremely difficult for them to get it right, because valid e-mail addresses as defined by RFCs 822 and 5322 fall outside the set of formal languages describable by most regular expression libraries. See this fun stackoverflow answer [0]. [0] http://stackoverflow.com/a/201378 http://stackoverflow.com/a/201378