Email Format Checker

Email Format Checker.md

Email Format Checker

Check Email Format in Golang and JavaScript.

使用 Golang 和 JavaScript 检查 Email 格式的合法性。

Code From: GitLab

emailFormatChecker.go

package main

import (
	"regexp"
)

var EmailChecker = regexp.MustCompile("^[-!#$%&'*+\\/0-9=?A-Z^_a-z{|}~](\\.?[-!#$%&'*+\\/0-9=?A-Z^_a-z`{|}~])*@[a-zA-Z0-9](-?\\.?[a-zA-Z0-9])*\\.[a-zA-Z](-?[a-zA-Z0-9])+$")

func EmailCheck(email string) bool {
	if len(email) == 0 || len(email) > 254 {
		return false
	}
	if !EmailChecker.MatchString(email) {
		return false
	}
	parts := strings.Split(email, "@")
	if len(parts[0]) > 64 {
		return false
	}
	domainParts := strings.Split(parts[1], ".")
	for _, val := range domainParts {
		if len(val) > 63 {
			return false
		}
	}
	return true
}

emailFormatChecker.js

const EmailChecker = /^[-!#$%&'*+\/0-9=?A-Z^_a-z{|}~](\.?[-!#$%&'*+\/0-9=?A-Z^_a-z`{|}~])*@[a-zA-Z0-9](-?\.?[a-zA-Z0-9])*\.[a-zA-Z](-?[a-zA-Z0-9])+$/;

export default email => {
  if (!email) {
    return false;
  }
  if (email.length > 254) {
    return false;
  }
  if (!EmailChecker.test(email)) {
    return false;
  }
  const parts = email.split("@");
  if (parts[0].length > 64) {
    return false;
  }
  const domainParts = parts[1].split(".");
  return domainParts.every(part => part.length < 64);
};