focalboard/server/services/auth/email.go

package auth

import "regexp"

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

// IsEmailValid checks if the email provided passes the required structure and length.
func IsEmailValid(e string) bool {
	if len(e) < 3 || len(e) > 254 {
		return false
	}
	return emailRegex.MatchString(e)
}