anchor.diff:      :   [a-zA-Z0-9$_] // these are the "java letters or digits" below 0x7F
       |   // covers all characters above 0x7F which are not a surrogate
           ~[\u0000-\u007F\uD800-\uDBFF]
  -        { Character.isJavaIdentifierPart(_input.LA(-1)) && !Character.isIdentifierIgnorable(_input.LA(-1)) }?
  +        { isJavaIdentifierPartAndNotIdentifierIgnorable(_input.LA(-1)) }?
       |   // covers UTF-16 surrogate pairs encodings for U+10000 to U+10FFFF
           [\uD800-\uDBFF] [\uDC00-\uDFFF]
           { Character.isJavaIdentifierPart(Character.toCodePoint((char) _input.LA(-2), (char) _input.LA(-1))) }?
  
positive.code: 
          return Integer.MIN_VALUE;
      }
  }
  
  
  
negative.code:     :   [a-zA-Z$_] // these are the "java letters" below 0x7F
      |   // covers all characters above 0x7F which are not a surrogate
          ~[\u0000-\u007F\uD800-\uDBFF]
          { isJavaIdentifierStartAndNotIdentifierIgnorable(_input.LA(-1)) }?
      |   // covers UTF-16 surrogate pairs encodings for U+10000 to U+10FFFF
          [\uD800-\uDBFF] [\uDC00-\uDFFF]
          { Character.isJavaIdentifierStart(Character.toCodePoint((char) _input.LA(-2), (char) _input.LA(-1))) }?
  