German postal code validator

Description

This package contains a class to validate a correct german postal code. This library checks only if the postal code is syntactical valid, not if them exists.

Validation

A valid german postal code

• starts with 0 to 9
• if postal code starts with 0, the next number is from 1 to 9
• if postal code starts with 1 to 9, the next number is from 0 to 9
• the last three nubers goes from 0 to 9