social-network-api/app/Http/Requests/RegisterUserRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class RegisterUserRequest extends ApiRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'name' => 'required|string',
            'username' => 'required|unique:users|regex:/^(?=[a-zA-Z0-9._]{3,20}$)(?!.*[_.]{2})[^_.].*[^_.]$/',
            'email' => 'required|email|unique:users',
            'password' => 'required',
            'c_password' => 'required|same:password',
            'gender' => 'required|in:man,woman,non-binary',
            'marital_status' => 'required|in:married,single,widow,divorced,complicated,relationship,swinger',
            'date_of_birth' => 'required|date'
        ];
    }
}