please use like this. this code worked me.

if ($request->has('search') && ! is_null($request->get('search')['value']) ) { 
 $regex = $request->get('search')['value']; 
 return $query->where(function($query) use($regex){ $queryNew- 
 >where('ccpl.pro_no', 'like', '%' . $regex . '%'); }); 
}