validation class

 This package provides a PEAR package for validating data, including:
  * numbers (min/max, decimal or not);
  * email (syntax, domain check, RFC 822 compliance);
  * strings (predefined type alpha upper and/or lowercase, numeric, etc.);
  * dates (min/max, RFC 822 compliance);
  * URIs (RFC 2396 compliance).
 Multiple checks can be performed by a single method call (::multiple).