Validate Mobile number using regular expression

Question

I need to validate mobile number. My need:

1. The number may start with +8801 or 8801 or 01
2. The next number can be 1 or 5 or 6 or 7 or

Answer 1

**Laravel Bangladeshi Phone No validation for (Citycell, Robi, Grameen Phone, Banglalink, Airtel and Teletalk) and start with +88/88 then 01 then 356789 then 8 digit**  



public function rules()
        {
            return [

                'mobile' => 'sometimes|regex:/^(?:\+?88)?01[35-9]\d{8}$/',

            ];
        }

        public function messages()
        {

                'mobile.regex' => 'Mobile no should be bd standard',
            ];
        }