Merge pull request yajra#245 from lisa-fehr/patch-4

Sort by a multi-line 'select as' query

Author: yajra

src/yajra/Datatables/Datatables.php

@@ -295,10 +295,10 @@ public static function of($builder)
      */
     private function getColumnName($str)
     {
-        preg_match('#^(\S*?)\s+as\s+(\S*?)$#si', $str, $matches);
+        $matches = explode(' as ', Str::lower($str));
 
         if (! empty($matches)) {
-            return $matches[2];
+            return array_pop($matches);
         } elseif (strpos($str, '.')) {
             $array = explode('.', $str);