Loosend regex to get aliases from subqueries and functions
Loosend regex to get aliases from subqueries and functions

Ordering columns were not detected if the pseudo column was a function or a subquery with a white space.
related to issue #41, #39 (partially)
walhalatur/laravel-datatables,matheusgomes17/laravel-datatables,rafaelqm/laravel-datatables,DarkaOnLine/laravel-datatables,hotfix31/lumen-datatables,ChaosPower/laravel-datatables,rafaelqm/laravel-datatables,yajra/laravel-datatables,thaigialai1987/laravel-datatables,ChaosPower/laravel-datatables,nmardones/laravel-datatables,smb/laravel-datatables