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Regular expression to validate email address

Example

package main

import (
	"fmt"
	"regexp"
)

func main() {
	str1 := "ç$€§/az@gmail.com"
	str2 := "abcd@gmail_yahoo.com"
	str3 := "abcd@gmail-yahoo.com"
	str4 := "abcd@gmailyahoo"
	str5 := "abcd@gmail.yahoo"

	re := regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")

	fmt.Printf("Pattern: %v\n", re.String()) // print pattern	
	fmt.Printf("\nEmail: %v :%v\n", str1, re.MatchString(str1))
	fmt.Printf("Email: %v :%v\n", str2, re.MatchString(str2))
	fmt.Printf("Email: %v :%v\n", str3, re.MatchString(str3))
	fmt.Printf("Email: %v :%v\n", str4, re.MatchString(str4))
	fmt.Printf("Email: %v :%v\n", str5, re.MatchString(str5))
}

Output

Pattern: ^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$

Email: ç$?§/az@gmail.com :false
Email: abcd@gmail_yahoo.com :false
Email: abcd@gmail-yahoo.com :true
Email: abcd@gmailyahoo :true
Email: abcd@gmail.yahoo :true
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