anchor.diff:     | [\u005D-\u00FF]
      ;
      // either a CRLF pair, OR a single octet other than NUL, CR, LF, or star
  -   
  +
   NOTSTAR
      : [\u0001-\u0009]
      | [\u000B-\u000C]
  
positive.code: /*
  BSD License
  
  Copyright (c) 2019, Tom Everett
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without
  
negative.code:    | [\u002B-\u00FF]
     ;
     // either a CRLF pair, OR a single octet  other than NUL, CR, LF, star, or slash
  
  ADDRESSPART
     : ':localpart'
     | ':domain'
  