An email address in Golang can be validated using the standard library function mail.ParseAddress. This function parses an RFC 5322 address, but by using it appropriately, we can also check if a string is a valid email address and get it from the "name <local-part@domain>" format.
package main
import (
"fmt"
"net/mail"
)
func validMailAddress(address string) (string, bool) {
addr, err := mail.ParseAddress(address)
if err != nil {
return "", false
}
return addr.Address, true
}
var addresses = []string{
"foo@gmail.com",
"Gopher <from@example.com>",
"example",
}
func main() {
for _, a := range addresses {
if addr, ok := validMailAddress(a); ok {
fmt.Printf("value: %-30s valid email: %-10t address: %s\n", a, ok, addr)
} else {
fmt.Printf("value: %-30s valid email: %-10t\n", a, ok)
}
}
}
Output:
value: foo@gmail.com valid email: true address: foo@gmail.com
value: Gopher <from@example.com> valid email: true address: from@example.com
value: example valid email: false 