email.go

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package main

import (
	"fmt"
	"net/mail"
	"strings"
)

func emailValid(email string) bool {
	_, err := mail.ParseAddress(email)
	return err == nil
}

func main() {
	for _, email := range []string{
		"good@exmaple.com",
		"bad-example",
		"foo bar@bar.com ",
	} {
		fmt.Printf("%18s valid: %t\n", email, emailValid(email))
	}

	var data = map[string]interface{}{
		"event": "something",
		"customer_properties": map[string]interface{}{
			"$email": strings.TrimSpace("hello@clark.co"),
		},
		"properties": map[string]interface{}{
			"lang": "en",
		},
	}

	cprops, _ := data["customer_properties"].(map[string]interface{})
	email, _ := cprops["$email"].(string)
	if emailValid(email) {
		fmt.Printf("email '%s' is valid\n", email)
	} else {
		fmt.Printf("email '%s' is NOT valid\n", email)
	}
}