CodeHighlighter.addStyle("ruby",{
  comment : {
    exp  : /(#[^\n]+)|(#\s*\n)/
  },
  brackets : {
    exp  : /\(|\)/
  },
  string : {
    exp  : /'[^']*'|"[^"]*"/
  },
  keywords : {
    exp  : /\b(extend|def|module|class|require)\b/
  },
  expression : {
    exp  : /\b(do|end|if|yield|then|else|for|trap|exit|until|unless|while|elsif|case|when|break|retry|redo|rescue|raise)\b|\bdefined\?/ },
  /* Added by Shelly Fisher (shelly@agileevolved.com) */
  symbol : {
    exp : /([^:])(:[A-Za-z0-9_!?]+)/
  },
  constant : {
    exp : /[A-Z]{1}\w+|\bself\b/
  },
  regex : {
    exp : /\/.+\//
  },
  number : {
    exp : /\d/
  }
});