Grr

gistfile1.txt

// What I would like to write:

UNQUOTED
  : UnquotedStartChar UnquotedChar*
    {but not matching WSLASH NUMBER}
  ;

// What it seems I actually have to write:

UNQUOTED
  // something not starting with a w
  : (EscapeSequence | ~(~UnquotedStartCharWithoutEscape|'W'|'w')) UnquotedChar*
  // something starting with a w but the next character not being a slash, or not having the next character
  | ('W'|'w') ( (EscapeSequence | ~(~UnquotedCharWithoutEscape|'/')) UnquotedChar* )?
  // something starting with a wslash but the rest of the string having at least one non-digit, or not having anything
  | WSLASH ( UnquotedChar* (EscapeSequence | ~(~UnquotedCharWithoutEscape|'0'..'9')) UnquotedChar* )?
  ;