Set Appbase route root in express3

app.js

app.get('/', page.index);

app.get('/approval', page.approval);

app.get('/task', page.task);

app.get('/report', page.report);

app.get('/admin', page.admin);

// Then implement root route path 
setRootRoute('/appA', app);

root_route.js

function cloneRegExp( input, injectPattern ) {
	var pattern = input.source;
	pattern.replace(injectPattern.find, injectPattern.replace);
	var flags = "";

	if ( input.global || ( /g/i ).test( injectFlags ) )
		flags += "g";

	if ( input.ignoreCase || ( /i/i ).test( injectFlags ) )
		flags += "i";

	if ( input.multiline || ( /m/i ).test( injectFlags ) )
		flags += "m";

	return( new RegExp( pattern, flags ) );
} 

function setRootRoute(rootRoute, app){
  var routes = app.routes,
      verb, paths;
  // Getting as HTTP verbs
  for(verb in routes){
    var paths = rotues[verb],
        regxSource;
    for(var i = 0; i < paths.length; i++){
      paths[i].path = rootRoute + paths[i].path;
      paths[i].regexp = cloneRegExp(paths[i].regexp, {find: "^", replace: "^"+rootRoute });
    }
  }
  return app;
}