Guess firstname and lastname from mail address

mail.go

// guessNameFromMail - Examples:
// warren.buffett@gmail.com -> Warren Buffett
// warren-buffett@gmail.com -> Warren Buffett
// warren_buffett@gmail.com -> Warren Buffett
// w-buffett123@gmail.com -> W. Buffett
func guessNameFromMail(mail string) (firstname, lastname string) {
	re := regexp.MustCompile(`^([A-Za-z]+)[\-\.\_]([A-Za-z]+)[0-9]*@`)
	matches := re.FindAllStringSubmatch(mail, -1)
	if len(matches) == 1 && len(matches[0]) == 3 {
		firstname := strings.Title(matches[0][1])
		lastname := strings.Title(matches[0][2])
		
		if len(firstname) == 1 {
			firstname = firstname + "."
		}
		return firstname, lastname
	}
	return "", ""
}