passing parameter to a query using WhereRaw Laravel 5

I, have a this code in controller:

$id = Input::get('pole');//input array like '1','3','4'
$st = implode("|", $id);
$data = Inat::latest('created_at')
->whereRaw("CONCAT(',', `t01_field`, ',') REGEXP BINARY ',(?),'",$st)->get();

it's not working, but this line is working perfectly: ->whereRaw("CONCAT(',',t01_field, ',') REGEXP BINARY ',(1|2|3),'")->get(); I think, problem because variable $st is a string, but how to convert same format 1|2|3

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