1.email_format ::

                   AND(DM_EMAIL__c!=NULL,NOT(REGEX( DM_EMAIL__c , "([A-Za-z0-9_\\-\\.])+@([A-Za-z0-9_\\-\\.])+\\.([A-Za-z]){2,3}")))

2.Nocommainmailingaddressline::

            CONTAINS( Mailing_Address_Line1__c , ",")

3.No Special Character In Name ::

      CONTAINS(Name, ",") || CONTAINS(Name, "@") || CONTAINS(Name, "#") || CONTAINS(Name, "*") || CONTAINS(Name, "+") || CONTAINS(Name, "=") || CONTAINS(Name, "{") || CONTAINS(Name, "<") || CONTAINS(Name, ">") || CONTAINS(Name, ":") || CONTAINS(Name, ";") || CONTAINS(Name, "~") || CONTAINS(Name, "`") || CONTAINS(Name, "}") || CONTAINS(Name, "[") || CONTAINS(Name, "]") || CONTAINS(Name, "'")|| CONTAINS(Name, "'")