Go Language - Validate Email Address Example

Email validation is required in nearly every application that has user registration in place. An email has its own structure, and before using it, we need to validate it. In Go Language, email validation can be performed by using the standard library function mail.ParseAddress() or regular expression.

Solution 1: Using the standard library function mail.ParseAddress()

package main

import (
    "fmt"
    "net/mail"
)
// Main function
func main() {
    fmt.Println(ValidateEmail("knowledgefactory-gmail.com"))
    fmt.Println(ValidateEmail("knowledgefactory4u@gmail.com"))
    fmt.Println(ValidateEmail("knowledge-factory4u@gmail.com"))
}
func ValidateEmail(email string) bool {
    _, err := mail.ParseAddress(email)
    return err == nil
}

Output:

Solution 2: Using regular expression

package main

import (
    "fmt"
    "regexp"
)
// Main function
func main() {
    fmt.Println(ValidateEmail("knowledgefactory-gmail.com"))
    fmt.Println(ValidateEmail("knowledgefactory4u@gmail.com"))
    fmt.Println(ValidateEmail("knowledge-factory4u@gmail.com"))
}
func ValidateEmail(email string) bool {
    pattern := "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+" +
        "@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])" +
        "?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]" +
        "{0,61}[a-zA-Z0-9])?)*$"
    emailRegex := regexp.MustCompile(pattern)
    return emailRegex.MatchString(email)
}

Output: