如何在golang中使用正则表达式验证手机号码归属地

import (
    "regexp"
    "net/http"
    "io/ioutil"
    "encoding/json"
)

type TaobaoResult struct {
    Code int `json:"code"`
    Data struct {
        City string `json:"city"`
    } `json:"data"`
}

var phoneRegex = regexp.MustCompile(`^1[3456789]d{9}$`)

func isPhoneValid(phone string) bool {
    return phoneRegex.MatchString(phone)
}

func getPhoneLocation(phone string) (string, error) {
    if !isPhoneValid(phone) {
        return "", fmt.Errorf("invalid phone number: %s", phone)
    }

    url := fmt.Sprintf("https://tcc.taobao.com/cc/json/mobile_tel_segment.htm?tel=%s", phone)
    resp, err := http.Get(url)
    if err != nil {
        return "", err
    }
    defer resp.Body.Close()

    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        return "", err
    }

    result := &TaobaoResult{}
    json.Unmarshal(body, result)

    if result.Code != 0 {
        return "", fmt.Errorf("error code: %d", result.Code)
    }

    return result.Data.City, nil
}

func main() {
    phone := "13812345678"
    location, err := getPhoneLocation(phone)
    if err != nil {
        fmt.Printf("failed to get location of %s: %s
", phone, err.Error())
    } else {
        fmt.Printf("%s belongs to %s
", phone, location)
    }
}