refactor: add regex validation for 'nama' field in AdditionalRequest

app/Http/Requests/Admin/AdditionalRequest.php

@@ -16,7 +16,7 @@ public function authorize(): bool
     public function rules(): array
     {
         return [
-            'nama'  => 'required|string|min:3|max:100',
+            'nama'  => 'required|string|min:3|max:100||regex:/^[a-zA-Z0-9\s\.,:"-]+$/',
             'harga' => 'required|numeric|min:0',
         ];
     }
@@ -27,6 +27,7 @@ public function messages(): array
             'required' => 'Kolom :attribute wajib diisi.',
             'numeric'  => ':attribute harus berupa angka.',
             'string'   => 'Input :attribute harus berupa teks valid.',
+            'regex'    => ':attribute hanya boleh berisi huruf, angka, spasi, titik, koma, tanda hubung dan tanda petik dua.',
             'min'      => ':attribute minimal harus :min karakter/nilai.',
             'max'      => ':attribute melebihi batas maksimal :max karakter.',
         ];