To let users revisit their email addresses without adding a second field for copy-pasting, Russ Unger of UserGlue and Jonathan Knoll found a nice solution: Dis

To let users revisit their email addresses without adding a second field for copy-pasting, Russ Unger of UserGlue and Jonathan Knoll found a nice solution: Display the email address on the submit button: http://www.userglue.com/blog/2009/09/09/solving-the-repeat-email-address-form-issue-maybe/comment-page-1/ http://www.userglue.com/blog/2009/09/09/solving-the-repeat-e... Also try out the live examples: http://infinityplusone.com/experiments/email-repeat/version5 http://infinityplusone.com/experiments/email-repeat/version5 Regexes take care of the syntax. The semantics still have to be checked by a human.