Validating Email Addresses is one of the more elusive patterns to define, but this pattern will match 99.99% of all email addresses in actual use today.
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[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])? |
A further change you could make is to allow any two-letter country code top level domain and only specific generic top level domains. This regex filters dummy email addresses like asdf@adsf.adsf. You will need to update it as new top-level domains are added.
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[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+(?:[A-Z]{2}|com|org|net|gov|biz|info|name|aero|biz|info|jobs|museum)\b |
Example using PHP:
This function will return true/false if the email values passed into it validates against the pattern.
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<?php function get_valid_email( $email ) { $regex = '/[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/i'; return preg_match($regex, trim($email), $matches); } ?> |