go get github.com/go-playground/validator/v10

package main
import "github.com/go-playground/validator/v10"
var validate *validator.Validate
func main() {
	validate = validator.New()
	// 验证变量
	email := "joeybloggs.gmail.com"
	randomString := "1234567890"
	err := validate.Var(email, "required,email")
	if err != nil {
		println("email:" + err.Error())
	}
	err = validate.Var(randomString, "required,email")
	if err != nil {
		println("random" + err.Error())
	}
}

randomKey: '' Error:Field validation for '' failed on the 'email' tag

package main

import "github.com/go-playground/validator/v10"

// 用户
type User struct {
	FirstName      string     `validate:"required"`
	LastName       string     `validate:"required"`
	Age            uint8      `validate:"gte=0,lte=130"`
	Email          string     `validate:"required,email"`
	FavouriteColor string     `validate:"iscolor"`                // alias for 'hexcolor|rgb|rgba|hsl|hsla'
	Addresses      []*Address `validate:"required,dive,required"` // a person can have a home and cottage...
}

// 地址
type Address struct {
	Street string `validate:"required"`
	City   string `validate:"required"`
	Planet string `validate:"required"`
	Phone  string `validate:"required"`
}

var validate *validator.Validate

func main() {
	validate = validator.New()
	user := User{}
	err := validate.Struct(user)
	if err != nil {
		println(err.Error())
	}
}

Key: 'User.FirstName' Error:Field validation for 'FirstName' failed on the 'required' tag
Key: 'User.LastName' Error:Field validation for 'LastName' failed on the 'required' tag
Key: 'User.Email' Error:Field validation for 'Email' failed on the 'required' tag
Key: 'User.FavouriteColor' Error:Field validation for 'FavouriteColor' failed on the 'iscolor' tag
Key: 'User.Addresses' Error:Field validation for 'Addresses' failed on the 'required' tag

package main

import (
	"github.com/go-playground/validator/v10"
	"regexp"
)

var validate *validator.Validate

func IsPhone(fl validator.FieldLevel) bool {
	// 如果是空值则跳过验证
	if fl.Field().String() == "" {
		return true
	}
	// 正则验证手机号
	matched, _ := regexp.MatchString(`^1[3456789]\d{9}$`, fl.Field().String())
	return matched
}

func main() {
	validate = validator.New()
	err := validate.RegisterValidation("isphone", IsPhone)
	if err != nil {
		panic(err)
	}
	randomStr := "1234567890"
	err = validate.Var(randomStr, "isphone")
	if err != nil {
		println(err.Error())
	}
}

func IsPhone(fl validator.FieldLevel) bool

func (s *Struct) IsPhone(fl validator.FieldLevel) bool

err := validate.RegisterValidation("isphone", IsPhone)

Key: '' Error:Field validation for '' failed on the 'isphone' tag

package main

import (
	"github.com/go-playground/locales/zh"
	ut "github.com/go-playground/universal-translator"
	"github.com/go-playground/validator/v10"
	zhTranslation "github.com/go-playground/validator/v10/translations/zh"
	"reflect"
	"regexp"
)

var validate *validator.Validate
var trans ut.Translator

func IsPhone(fl validator.FieldLevel) bool {
	// 如果是空值则跳过验证
	if fl.Field().String() == "" {
		return true
	}
	// 正则验证手机号
	matched, _ := regexp.MatchString(`^1[3456789]\d{9}$`, fl.Field().String())
	return matched
}
func initTranslate() {
	//初始化错误翻译器
	trans, _ = ut.New(zh.New()).GetTranslator("zh")
	validate = validator.New()
	//使用fld.Tag.Get("comment")注册一个获取tag的自定义方法以实现翻译Field
	validate.RegisterTagNameFunc(func(fld reflect.StructField) string {
		return fld.Tag.Get("tag")
	})
	err := validate.RegisterValidation("isphone", IsPhone)
	if err != nil {
		panic(err)
	}
	_ = validate.RegisterTranslation("isphone", trans, func(ut ut.Translator) error {
		return ut.Add("isphone", "{0}该参数不是一个手机号", true)
	}, func(ut ut.Translator, fe validator.FieldError) string {
		t, _ := ut.T("isphone", fe.Field())
		return t
	})
	err = zhTranslation.RegisterDefaultTranslations(validate, trans)
	if err != nil {
		println("注册错误翻译器失败：" + err.Error())
	}
	println("注册错误翻译器成功")
}

type User struct {
	Phone string `json:"phone" validate:"required,isphone" tag:"手机号"`
}

func main() {
	initTranslate()
	err := validate.Struct(User{
		Phone: "0123456789",
	})
	if err != nil {
		err := err.(validator.ValidationErrors)
		for _, e := range err.Translate(trans) {
			println(e)
		}
	}
}

注册错误翻译器成功
手机号该参数不是一个手机号