how if charactor is exist in text in laravel code example

Example: how if charactor is exist in text in laravel

$str_contains = $request->birthDay;
if(str_contains($request->birthDay , '-')){
  return 'this text contains "-" charactors';
}elseif(str_contains($request->birthDay , '/')){
  return 'this text contains "/" charactors';
}