A couple functions using the LongURL API v2 to generate a regular expression string to match virtually any shortened URL, resulting in something similar to http://gist.github.com/KuroTsuto/8448070

Generate Shortened URL RegEx Using LongURL.org API

// Grab the shortened URL services from api.longurl.org/v2/services, generate a regex pattern for all
function generateShortenedURLRegEx( fn_callback ) {
	longURLAPICall( "services", {}, function( data ) {
		var regExString = "(?:https?:\\/\\/)?(?:";
		var serviceCount = 0;
		var regExp;

		for( var service in data ) {
			if( data.hasOwnProperty( service ) ) {
				if( service.charAt( service.length - 1 ) == '.' )
					continue;	// Ignore the weird domains that end with a dot and don't specify a TLD... @TODO: ask LongURL what these domains are supposed to imply

				if( ++serviceCount > 1 )
					regExString += "|";

				if( data[ service ].regex == "" ) {
					regExString += "(?:" + data[ service ].domain.replace( ".", "\\." ) + ")";
				}
				else
					regExString += "(" + data[ service ].regex + ")";
			}
		}

		regExString += ")\\/[a-z0-9]*";

		fn_callback( regExString );
	} );
};

function longURLAPICall( str_endpoint, ob_data, fn_callback ) {
	var xhr = new XMLHttpRequest();
	var url = "http://api.longurl.org/v2/" + str_endpoint;
	var async = fn_callback != undefined && fn_callback instanceof Function;
	var datastring = "";
	var datacount = 0;

	if( ob_data == undefined || typeof ob_data == "undefined" || ! ob_data instanceof Object )
		ob_data == {};

	ob_data.format = "json";

	for( var key in ob_data ) {
		if( ob_data.hasOwnProperty( key ) ) {
			if( ++datacount > 1 )
				datastring += "&";
			else
				datastring += "?";

			datastring += key + "=" + encodeURIComponent( ob_data[ key ] );
		}
	}

	url += datastring;

	if( async ) {
		xhr.responseType = "json";
		xhr.onreadystatechange = function( e ) {
			if( xhr.readyState == 4 ) {
				if( xhr.status >= 200 && xhr.status < 300 ) {
					fn_callback( xhr.response );
				}
				else {
					console.log( "Error: LongURL API returned HTTP status code " + xhr.status + " with the text, \"" + xhr.statusText + "\"" );
				}
			}
		};
	}

	xhr.open( "GET", url, async );
	xhr.setRequestHeader( "user_agent", "GitHubGist8447974/0.0.3" ); 
	xhr.send();

	if( !async ) {
		if( xhr.readyState == 4 ) {
			if( xhr.status >= 200 && xhr.status < 300 ) {
				return JSON.parse( xhr.response );
			}
			else {
				console.log( "Error: LongURL API returned HTTP status code " + xhr.status + " with the text, \"" + xhr.statusText + "\"" );
			}
		}
	}
};