最严谨的校验email地址的正则表达式及各种语言对(2)

/(?(DEFINE) (?<address> (?&mailbox) | (?&group)) (?<mailbox> (?&name_addr) | (?&addr_spec)) (?<name_addr> (?&display_name)? (?&angle_addr)) (?<angle_addr> (?&CFWS)? < (?&addr_spec) > (?&CFWS)?) (?<group> (?&display_name) : (?:(?&mailbox_list) | (?&CFWS))? ; (?&CFWS)?) (?<display_name> (?&phrase)) (?<mailbox_list> (?&mailbox) (?: , (?&mailbox))*) (?<addr_spec> (?&local_part) \@ (?&domain)) (?<local_part> (?&dot_atom) | (?&quoted_string)) (?<domain> (?&dot_atom) | (?&domain_literal)) (?<domain_literal> (?&CFWS)? \[ (?: (?&FWS)? (?&dcontent))* (?&FWS)? \] (?&CFWS)?) (?<dcontent> (?&dtext) | (?&quoted_pair)) (?<dtext> (?&NO_WS_CTL) | [\x21-\x5a\x5e-\x7e]) (?<atext> (?&ALPHA) | (?&DIGIT) | [!#\$%&'*+-/=?^_`{|}~]) (?<atom> (?&CFWS)? (?&atext)+ (?&CFWS)?) (?<dot_atom> (?&CFWS)? (?&dot_atom_text) (?&CFWS)?) (?<dot_atom_text> (?&atext)+ (?: \. (?&atext)+)*) (?<text> [\x01-\x09\x0b\x0c\x0e-\x7f]) (?<quoted_pair> \\ (?&text)) (?<qtext> (?&NO_WS_CTL) | [\x21\x23-\x5b\x5d-\x7e]) (?<qcontent> (?&qtext) | (?&quoted_pair)) (?<quoted_string> (?&CFWS)? (?&DQUOTE) (?:(?&FWS)? (?&qcontent))* (?&FWS)? (?&DQUOTE) (?&CFWS)?) (?<word> (?&atom) | (?&quoted_string)) (?<phrase> (?&word)+) # Folding white space (?<FWS> (?: (?&WSP)* (?&CRLF))? (?&WSP)+) (?<ctext> (?&NO_WS_CTL) | [\x21-\x27\x2a-\x5b\x5d-\x7e]) (?<ccontent> (?&ctext) | (?&quoted_pair) | (?&comment)) (?<comment> \( (?: (?&FWS)? (?&ccontent))* (?&FWS)? \) ) (?<CFWS> (?: (?&FWS)? (?&comment))* (?: (?:(?&FWS)? (?&comment)) | (?&FWS))) # No whitespace control (?<NO_WS_CTL> [\x01-\x08\x0b\x0c\x0e-\x1f\x7f]) (?<ALPHA> [A-Za-z]) (?<DIGIT> [0-9]) (?<CRLF> \x0d \x0a) (?<DQUOTE> ") (?<WSP> [\x20\x09]) ) (?&address)/x

Ruby (simpler version)

/\A([\w+\-].?)+@[a-z\d\-]+(\.[a-z]+)*\.[a-z]+\z/i

.NET

^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$

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