Try this Textarea:
Some checkboxes: 1 2 3 4 5
The following fields are all type validated in the config file: (a) Number (checked by isnumber in the config file) (b) Integer (checked by isinteger in the config file) (c) Email (checked by isemail in the config file) (d) Credit Card Number (4242424242424242 is a valid example VISA number) (checked by iscreditcard in the config file)