Methods to format tweets with html.

format-tweet.js

(function () {
    'use strict';

    var userRegex = /(^|\s)(@(\w){1,15})/gi;
    var urlRegex = /(^|\s)(https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*))/gi;

    var linkUsers = function (tweet) {
        return tweet.replace(userRegex, function ($m, $1, $2) {
            return $1 + '<a href="https://twitter.com/' + $2 + '" target="_blank">' + $2 + '</a>';
        });
    };

    var linkUrl = function (tweet) {
        return tweet.replace(urlRegex, function ($m, $1, $2) {
            return $1 + '<a href="' + $2 + '" target="_blank">' + $2 + '</a>';
        });
    };

    var formatTweet = function (tweet) {
        tweet = linkUsers(tweet);
        tweet = linkUrl(tweet);
        return tweet;
    };

}());