Replaces Twitter username, hashtag, and link text with links.

parse-tweets.js

function parseTweet(tweet) {
    var urlRegex = /[A-Za-z]+:\/\/[A-Za-z0-9-_]+\.[A-Za-z0-9-_:%&~\?\/.=]+/g,
        userRegex = /[@]+[A-Za-z0-9-_]+/g,
        hashRegex = /[#]+[A-Za-z0-9-_]+/g;
            
    tweet = tweet.replace(urlRegex, function(url) {
        return url.link(url);
    });
            
    tweet = tweet.replace(userRegex, function(username) {
        var rawUsername = username.replace("@", "");
        return username.link("http://twitter.com/#!/"+rawUsername);
    });
            
    tweet = tweet.replace(hashRegex, function(hash) {
        var encodedHash = hash.replace("#", "%23");
        return hash.link("http://search.twitter.com/search?q="+encodedHash);
    });
            
    return tweet;
}