B4J Code Snippet Email validation using RegEx

This regex example uses all the characters permitted by RFC 5322, which governs the email message format. Among the permitted characters are some that present a security risk if passed directly from user input to an SQL statement, such as the single quote (‘) and the pipe character (|). You should run your db queries with parameters or be sure to escape sensitive characters when inserting the email address into a string passed to another program, in order to prevent security holes such as SQL injection attacks.
'Tests given string if it looks like an email address
Public Sub IsValidEmail(EmailAddress As String) As Boolean
    Return Regex.IsMatch("^[\w!#$%&’*+/=?`{|}~^-]+(?:\.[\w!#$%&’*+/=?`{|}~^-]+)*@(?:[a-zA-Z0-9-]+\.)+[a-zA-Z]{2,63}$", EmailAddress)
End Sub