anchor.diff:      ;
   
   linebreak
  -    : BACKSLASH BACKSLASH
  +    : '\\\\'
       ;
   
   bold
  -    : '**' markup '**'
  +    : '**' markup '**'?
       ;
   
   italics
  
positive.code:     ;
  
  tableheader
      : ('|=' markup)+ '|' WS*
      ;
  
  tablerow
  
negative.code:     | ')'
      | '-'
      | '/'
      | '\\'
      | '\''
      | '~'
      | '"'
      | '+'
      ;
  