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use RegularGrammar;
/// URI Authority.
///
/// # Grammar
///
/// ```abnf
/// authority = [ userinfo "@" ] host [ ":" port ]
///
/// userinfo = *( unreserved / pct-encoded / sub-delims / ":" )
///
/// host = IP-literal / IPv4address / reg-name
///
/// port = *DIGIT
/// ```
///
/// ## Host rules
///
/// ```abnf
/// IP-literal = "[" ( IPv6address / IPvFuture ) "]"
///
/// IPvFuture = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" )
///
/// IPv6address = 6( h16 ":" ) ls32
/// / "::" 5( h16 ":" ) ls32
/// / [ h16 ] "::" 4( h16 ":" ) ls32
/// / [ *1( h16 ":" ) h16 ] "::" 3( h16 ":" ) ls32
/// / [ *2( h16 ":" ) h16 ] "::" 2( h16 ":" ) ls32
/// / [ *3( h16 ":" ) h16 ] "::" h16 ":" ls32
/// / [ *4( h16 ":" ) h16 ] "::" ls32
/// / [ *5( h16 ":" ) h16 ] "::" h16
/// / [ *6( h16 ":" ) h16 ] "::"
///
/// ls32 = ( h16 ":" h16 ) / IPv4address
/// ; least-significant 32 bits of address
///
/// h16 = 1*4HEXDIG
/// ; 16 bits of address represented in hexadecimal
///
/// IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet
///
/// dec-octet = DIGIT ; 0-9
/// / %x31-39 DIGIT ; 10-99
/// / "1" 2DIGIT ; 100-199
/// / "2" %x30-34 DIGIT ; 200-249
/// / "25" %x30-35 ; 250-255
///
/// reg-name = *( unreserved / pct-encoded / sub-delims )
/// ```
///
/// ## Misc rules
///
/// ```abnf
/// reserved = gen-delims / sub-delims
///
/// gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@"
///
/// sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
/// / "*" / "+" / "," / ";" / "="
///
/// unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
///
/// pct-encoded = "%" HEXDIG HEXDIG
/// ```
;