Validate String: This class validate string types (urls,email, ...)

Validation class for validation of misc strings.
Ideal to validate form data.
Yet it can validate the following string types:

- alphabetical
- alphabetical lowercase
- alphabetical uppercase
- numerical
- alphanumerical
- postcodes for:

austria
australia
germany
estonia
netherlands
italy
sweden
united kingdom
united states
- email
- url
- ip address

I would be pleased, if anybody can give me the ereg patterns for other countries! Please mail me and I'll add the country to the country array!