/PHP/Laravel/How if charactor is exist in text in laravel

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';
}

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