/
^ (?&address) $
(?(DEFINE)
(?<ALPHANUMERICE>
[A-Za-z0-9!\#$%&'*+\-\/=?^_`{|}~]
)
(?<CFWS>
(?:
(?: (?&FWS)? (?&comment) )++
(?&FWS)?
)
| (?&FWS)
)
(?<FWS> (?&WSPCRLF)++ )
(?<UTF8_extra_char>
(?=[\x{C2}-\x{DF}\x{E0}-\x{EF}\x{F0}-\x{F4}])
(?: (?&UTF8_2) | (?&UTF8_3) | (?&UTF8_4) )
)
(?<UTF8_tail> [\x{80}-\x{BF}] )
(?<UTF8_2> [\x{C2}-\x{DF}] (?&UTF8_tail) )
(?<UTF8_3> \x{E0} [\x{A0}-\x{BF}] (?&UTF8_tail)
| [\x{E1}-\x{EC}] (?&UTF8_tail){2}
| \x{ED} [\x{80}-\x{9F}] (?&UTF8_tail)
| [\x{EE}\x{EF}] (?&UTF8_tail){2}
)
(?<UTF8_4> \x{F0} [\x{90}-\x{BF}] (?&UTF8_tail){2}
| [\x{F1}-\x{F3}] (?&UTF8_tail){3}
| \x{F4} [\x{80}-\x{8F}] (?&UTF8_tail){2}
)
(?<VCHARWSP> [\x{21}-\x{7E}\ \t] )
(?<WSPCRLF> [\ \t\x{0D}\x{0A}] )
(?<address> (?&mailbox_list) | (?&group) )
(?<addr_spec> (?&local_part) @ (?&domain) )
(?<utf8_addr_spec>
(?&utf8_local_part) @ (?&utf8_domain)
)
(?<alt_address> (?&FWS) < (?&addr_spec) > )
(?<angle_addr> (?&CFWS)? <
(?: (?&addr_spec)
| (?&utf8_addr_spec) (?&alt_address)?
| (?&obs_route)? (?&addr_spec)
)
> (?&CFWS)?
)
(?<atext> (?&ALPHANUMERICE) )
(?<utf8_atext>
(?&ALPHANUMERICE)
| (?&UTF8_extra_char)
)
(?<atom> (?&CFWS)? (?&atext)++ (?&CFWS)? )
(?<utf8_atom>
(?&CFWS)? (?&utf8_atext)++ (?&CFWS)?
)
(?<utf8_ccontent>
(?&ctext)
| (?&utf8_quoted_pair)
| (?&comment)
)
(?<comment>
\(
(?:
(?&FWS)? (?&utf8_ccontent)
)*+
(?&FWS)?
\)
)
(?<ctext>
[!-'*-\[\]-~]
| (?&obs_ctext)
| (?&UTF8_extra_char)
)
(?<display_name> (?&phrase) )
(?<domain>
(?&dot_atom)
| (?&domain_literal)
| (?&obs_domain)
)
(?<utf8_domain>
(?&utf8_dot_atom)
| (?&domain_literal)
| (?&obs_domain)
)
(?<domain_literal>
(?&CFWS)?
\[
(?: (?&FWS)? (?&dtext) )*+
(?&FWS)?
\]
(?&CFWS)?
)
(?<dot_atom>
(?&CFWS)? (?&dot_atom_text) (?&CFWS)?
)
(?<utf8_dot_atom>
(?&CFWS)? (?&utf8_dot_atom_text) (?&CFWS)?
)
(?<dot_atom_text>
(?&atext)++
(?: \. (?&atext)++ )*+
)
(?<utf8_dot_atom_text>
(?&utf8_atext)++
(?: \. (?&utf8_atext)++ )*+
)
(?<dtext> [!-Z^-~] | (?&obs_dtext) )
(?<group>
(?&display_name) : (?&group_list)? ; (?&CFWS)?
)
(?<group_list>
(?&mailbox_list)
| (?&CFWS)
| (?&obs_group_list)
)
(?<local_part>
(?&dot_atom)
| (?"ed_string)
| (?&obs_local_part)
)
(?<utf8_local_part>
(?&utf8_dot_atom)
| (?&utf8_quoted_string)
| (?&obs_local_part)
)
(?<mailbox>
(?&name_addr)
| (?&addr_spec)
| (?&utf8_addr_spec)
)
(?<mailbox_list>
(?:
(?&mailbox) (?: , (?&mailbox) )*+
)
| (?&obs_mbox_list)
)
(?<name_addr> (?&display_name)? (?&angle_addr) )
(?<obs_NO_WS_CTL>
[\x{01}-\x{08}\x{0B}\x{0C}\x{0E}-\x{1F}\x{7F}]
)
(?<obs_ctext> (?&obs_NO_WS_CTL) )
(?<obs_domain> (?&atom) (?: \. (?&atom) )*+ )
(?<obs_domain_list>
(?: (?&CFWS) | , )*+
@ (?&domain)
(?: , (?&CFWS)? (?: @ (?&domain) )? )*+
)
(?<obs_dtext>
(?&obs_NO_WS_CTL) | (?"ed_pair)
)
(?<obs_group_list> (?: (?&CFWS)? , )++ (?&CFWS)? )
(?<obs_local_part> (?&word) (?: \. (?&word) )*+ )
(?<obs_mbox_list>
(?: (?&CFWS)? , )*+
(?&mailbox)
(?: ,
(?: (?&mailbox) | (?&CFWS))?
)*+
)
(?<obs_phrase>
(?&word)
(?: (?&word) | \. | (?&CFWS) )*+
)
(?<obs_qp>
\\
(?:
\x{00}
| (?&obs_NO_WS_CTL)
| [\x{0D}\x{0A}]
)
)
(?<obs_qtext> (?&obs_NO_WS_CTL) )
(?<obs_route> (?&obs_domain_list) : )
(?<phrase> (?&word)++ | (?&obs_phrase) )
(?<qcontent> (?&utf8_qcontent) )
(?<utf8_qcontent>
(?&utf8_qtext)
| (?&utf8_quoted_pair)
)
(?<qtext> [!\#-\[\]-~] | (?&obs_qtext) )
(?<utf8_qtext> (?&qtext) | (?&UTF8_extra_char) )
(?<quoted_pair>
\\ (?&VCHARWSP) | (?&obs_qp)
)
(?<utf8_quoted_pair>
\\ (?&utf8_text) | (?&obs_qp)
)
(?<utf8_text>
[\x{01}-\x{09}\x{0D}\x{0A}\x{0E}-\x{7F}]
| (?&UTF8_extra_char)
)
(?<quoted_string>
(?&CFWS)? "
(?: (?&FWS)? (?&qcontent) )*+
(?&FWS)? " (?&CFWS)?
)
(?<utf8_quoted_string>
(?&CFWS)? "
(?: (?&FWS)? (?&utf8_qcontent) )*+
(?&FWS)? " (?&CFWS)?
)
(?<word> (?&utf8_atom) | (?&utf8_quoted_string) )
)
/
x