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You appear to mean "directly before the @". Thanks for the clarification. Email::Valid::Loose further clarifies:

Email::Valid::Loose is a subclass of Email::Valid, which allows . (dot) before @ (at-mark). It is invalid in RFC822, but is commonly used in some of mobile phone addresses in Japan (like docomo.ne.jp or jp-t.ne.jp).

So the items identified so far:

  • Allow /\.\@/
  • Disallow /\@.*%/ (actually more, since you answered my question in the negative in a private /msg and promised more details later)
  • Disallow CFWS w/in the address
  • Require /\@.*\./
  • Require /\.[a-zA-Z]{2,}$/
  • Require RFC1035-compliant domain (except empty ones)
  • Extend RFC1035 to allow domain labels that start with a digit
  • Disallow quoting (usually of $local_part)
  • Disallow escaping (usually of $local_part)
  • Disallow /\+.*\@/
  • Disallow "group"s (/$display_name:$mailbox_list;/)
  • Disallow "name-addr" (/$display_name?$angle_addr/)
  • Disallow "obs*" (obs-angle-addr, obs-mbox-list, obs-addr-list, obs-local-part, obs-domain)

- tye        


In reply to Re^4: Practical e-mail address validation (flexes) by tye
in thread Practical e-mail address validation by tye

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