go-email-normalizer - email normalization for Go

This is Golang library for providing a canonical representation of email address. It allows to prevent multiple signups. go-email-normalizer contains some popular providers but you can easily append others.

Download

go get -u github.com/dimuska139/go-email-normalizer/v2

Usage

package main

import (
	"fmt"
	"strings"
	normalizer "github.com/dimuska139/go-email-normalizer/v2"
)

type customRule struct {}

func (rule *customRule) ProcessUsername(username string) string {
	return strings.Replace(username, "-", "", -1)
}

func (rule *customRule) ProcessDomain(domain string) string {
	return domain
}

func main() {
	n := normalizer.NewNormalizer()
	fmt.Println(n.Normalize("vasya+pupkin@gmail.com")) // vasya@gmail.com
	fmt.Println(n.Normalize("t.e-St+vasya@gmail.com")) // te-st@gmail.com
	fmt.Println(n.Normalize("t+.-est@yahoo.com"))      // t+.est@yahoo.com
	fmt.Println(n.Normalize("t.e-St+@googlemail.com")) // te-st@gmail.com
	fmt.Println(n.Normalize("t.e-St+@google.com"))     // te-st@gmail.com
	
	n.AddRule("customrules.com", &customRule{})
	fmt.Println(n.Normalize(" tE-S-t@CustomRules.com.")) // tESt@customrules.com
}

Supported providers

• Apple
• Fastmail
• Google
• Microsoft
• Protonmail
• Rackspace
• Rambler
• Yahoo
• Yandex
• Zoho

Also you can integrate other rules using AddRule function (see an example above)