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Here's the email validation rules as source code. Licensing information for each one is included at the top of the file.

email_regexp.php (3.9 k)
PHP version of email validator that is based on regular expression rules.
email_test.php (8.4 k)
Alternate PHP email validator that does not use any PCRE functions
email_test.js (8 k)
JavaScript email validator
Washington Post's Style Invitational 2003 Winner:

Beelzebug: Satan in the form of a mosquito that gets into your bedroom at three in the morning and cannot be cast out.
Tyler Akins <>
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