May 26, 2018
Common data validation methods for IPs
This module collects IP validation routines to make input validation, and untainting easier and more readable.
All functions return an untainted value if the test passes, and undef if it fails. This means that you should always check for a defined status explicitly. Don’t assume the return will be true. e.g. is_username’0’
The value to test is always the first and often only argument.