anchor.diff:  
   connectStmt
       : K_CONNECT host SLASH port -> ^(NODE_CONNECT host port)
  -    | K_CONNECT ip SLASH port -> ^(NODE_CONNECT ip port)
  +    | K_CONNECT ipaddr SLASH port -> ^(NODE_CONNECT ipaddr port)
       ;
   
   helpStmt
  
positive.code:     '\'' (~'\'')* '\'' ( '\'' (~'\'')* '\'' )* 
      ;
  
  IntegerLiteral
     : Digit+;
  
  
  HostIdentifier
      : ( Letter | Digit ) ( Letter | Digit | DOT | '-' )* ( Letter | Digit )
      ;
  
  //
  // syntactic elements
  
negative.code:     : '0'..'9'
      ;
  
  fragment
  Alnum
      : Letter
      | Digit
      ;
  
  // syntactic Elements
  Identifier
      : Letter ( Alnum | '_' )*
      ;
  
  // literals
  