Class: Validation Engine

This class implements many rules for validating text field values.

It can be used to validate field values submitted using Web forms.

It can return a validation summary report using customizable error messages style.

Currently it supports the following validation types:

- Numeric within a range
- Regular expression match
- Email address
- Date
- Comparison of two field values,
- Text with a minimum and maximum length
- Custom for user-defined validation

Each text field value may be required or not and have associated individual error messages.

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