anchor.diff:  
   oneormore
       : RPAREN alternatives LPAREN
  +    ;
  +
  +captext
  +    : CAPTEXT
       ;
   
   text
  
positive.code:     : '"' .*? '"'
      ;
  
  fragment LETTER
      : 'a'..'z'
      | 'A'..'Z'
      ;
  
  fragment DIGIT
  
negative.code:     : '|'
      ;
  
  CAPTEXT
      : UPPERCASE_LETTER TEXT
      ;
  
  TEXT
      : (UPPERCASE_LETTER | LOWERCASE_LETTER | DIGIT| SYMBOL)+
      ;
  
  /*
  