With this package, one can easily validate various data. It includes numbers, email, string, date, URI and posibility valid multiple data with a single method call.
Example 66-1. Validating an email address
Example 66-2. Validating dates
In this example, date would first checked against desired format, and then get checked to see if it's not before "15 February 1986" or after "23 August 2008".