Validate Data: Data validation with support for multibyte text

This class is meant to be used to validate the data, for instance entered in forms. It supports the detection of multibyte text characters.

The files provided are in EUC-JP format.

It provides following types of validations:

- E-mail addresses
- Dates
- Only alphabetic character strings
- Only alphanumeric character strings
- Detects strings using a multibyte encoding (Asian character sets)
- Verify whether strings contain only valid Hiragana, Katakana or Kanji characters
- Get length of characters of a text string