Linkify the text of a tweet

tweet-linkify.js

var linkify_tweet = function(tweet) {
  tweet = tweet.replace(/(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig,"<a href='$1'>$1</a>");
  tweet = tweet.replace(/(^|\s|\.)@(\w+)/g, "$1<a href=\"http://www.twitter.com/$2\">@$2</a>");
  return tweet.replace(/(^|\s)#(\w+)/g, "$1<a href=\"http://search.twitter.com/search?q=%23$2\">#$2</a>");
};