parseTweet.js

var parseTweet = function(tweetText) {
  var reghash, reguri, regusername;
  reguri = /(https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&\/=]*))/g;
  regusername = /([@]+([A-Za-z0-9-_]+))/g;
  reghash = /[#]+([A-Za-z0-9-_]+)/g;
  tweetText = tweetText.replace(reguri, "<a href='$1' target='_blank'>$1</a>");
  tweetText = tweetText.replace(regusername, "<a href='http://twitter.com/$2' target='_blank'>$1</a>");
  tweetText = tweetText.replace(reghash, "<a href='http://twitter.com/search?q=%23$1' target='_blank'>#$1</a>");
  return tweetText;
};