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SIP basic rules

Section 25.1 of RFC 3261

alphanum =
ALPHA /  DIGIT
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LHEX =
DIGIT /  %x61‑66
; lowercase a‑f
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LWS =
[ *WSP  CRLF ]  1*WSP
; linear whitespace
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SWS =
[ LWS ]
; sep whitespace
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HCOLON =
*( SP /  HTAB )   ":"   SWS
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separators =
"(" /  ")" /  "<" /  ">" /  "@" /  "," /  ";" /  ":" /  "\" /  DQUOTE /  "/" /  "[" /  "]" /  "?" /  "=" /  "{" /  "}" /  SP /  HTAB
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STAR =
SWS  "*"  SWS
; asterisk
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SLASH =
SWS  "/"  SWS
; slash
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EQUAL =
SWS  "="  SWS
; equal
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LPAREN =
SWS  "("  SWS
; left parenthesis
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RPAREN =
SWS  ")"  SWS
; right parenthesis
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LAQUOT =
SWS  "<"
; left angle quote
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RAQUOT =
">"  SWS
; right angle quote
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COMMA =
SWS  ","  SWS
; comma
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SEMI =
SWS  ";"  SWS
; semicolon
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COLON =
SWS  ":"  SWS
; colon
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LDQUOT =
SWS  DQUOTE
; open double quotation mark
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RDQUOT =
DQUOTE  SWS
; close double quotation mark
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token =
1*( alphanum /  "-" /  "." /  "!" /  "%" /  "*" /  "_" /  "+" /  "`" /  "'" /  "~" )
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quoted-string =
SWS   DQUOTE   *( qdtext /  quoted‑pair )   DQUOTE
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qdtext =
LWS /  %x21 /  %x23‑5B /  %x5D‑7E /  UTF8‑NONASCII
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quoted-pair =
"\"  ( %x00‑09 /  %x0B‑0C /  %x0E‑7F )
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comment =
LPAREN   *( ctext /  quoted‑pair /  comment )   RPAREN
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ctext =
%x21‑27 /  %x2A‑5B /  %x5D‑7E /  UTF8‑NONASCII /  LWS
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word =
1*( alphanum /  "-" /  "." /  "!" /  "%" /  "*" /  "_" /  "+" /  "`" /  "'" /  "~" /  "(" /  ")" /  "<" /  ">" /  ":" /  "\" /  DQUOTE /  "/" /  "[" /  "]" /  "?" /  "{" /  "}" )
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TEXT-UTF8-TRIM =
1*TEXT‑UTF8char   *( *LWS   TEXT‑UTF8char )
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TEXT-UTF8char =
%x21‑7E /  UTF8‑NONASCII
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UTF8-NONASCII =
%xC0-DF   1UTF8‑CONT /
%xE0-EF   2UTF8‑CONT /
%xF0-F7   3UTF8‑CONT /
%xF8-FB   4UTF8‑CONT /
%xFC-FD   5UTF8‑CONT
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UTF8-CONT =
%x80-BF
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escaped =
"%"   HEXDIG   HEXDIG
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mark =
"-" /  "_" /  "." /  "!" /  "~" /  "*" /  "'" /  "(" /  ")"
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reserved =
";" /  "/" /  "?" /  ":" /  "@" /  "&" /  "=" /  "+" /  "$" /  ","
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unreserved =
alphanum /  mark
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