This extension validates server-side name and email submitted by a non-logged in user against regex, checks if they are used by registered member and outputs error message if so.
Try to submit form by entering something which is forbidden by this add-on:
1) name which includes non-alphanumeric characters
2) invalid email, such as name@google.
3) the name "Laisvunas" which is used by registered member
Notice. Please, post something sensible. Otherwise computer will think your comment is a spam.