title: Defining antlr rule for identifiers with one character
body: <p>i like to define a very simple rule, which should represent identifiers. This works quite well for identifiers which are longer than one characters, but for identifiers with exactly one character I get a MismatchedTokenException(64!=45). This is the rule:</p>
  
  <p>ID  :   ('a'..'z' | 'A'..'Z')+
      ;</p>
  
  <p>What is wrong with that?</p>
  
  <p>Thanks!</p>