I want someone who's playing with the beta compiler to test it on the regex that can validate almost all of the disgusting edge cases that the email spec actually allows not just a basic user+suffix@domain.tld matching pattern that most of call good enough and share the explanations output.
Consider it a stress test. Can the explain function actually output a full explanation without truncating it, and will CP allow a message that long. 
(?:(?:\r\n)?[ \t])(?:(?:(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t])))@(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t])))|(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))\<(?:(?:\r\n)?[ \t])(?:@(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t])))(?:,@(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t])))):(?:(?:\r\n)?[ \t]))?(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t])))@(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t])))>(?:(?:\r\n)?[ \t]))|(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t])):(?:(?:\r\n)?[ \t])(?:(?:(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t])))@(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t])))|(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))\<(?:(?:\r\n)?[ \t])(?:@(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t])))(?:,@(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t])))):(?:(?:\r\n)?[ \t]))?(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t])))@(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t])))>(?:(?:\r\n)?[ \t]))(?:,\s(?:(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t])))@(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t])))|(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))\<(?:(?:\r\n)?[ \t])(?:@(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t])))(?:,@(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t])))):(?:(?:\r\n)?[ \t]))?(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|"(?:[^\"\r\]|\.|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t])))@(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t]))(?:.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\".[] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[["()<>@,;:\".[]]))|[([^[]\r\]|\.)](?:(?:\r\n)?[ \t])))>(?:(?:\r\n)?[ \t]))))?;\s)
https://stackoverflow.com/a/20773069/85661
And as always remember Codethulu fhtagn and be happy you're not trying to match HTML. 
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
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