FAQ 4.19 How do I validate input?

Do you have a question? Post it now! No Registration Necessary.  Now with pictures!

This is an excerpt from the latest version perlfaq4.pod, which
comes with the standard Perl distribution. These postings aim to
reduce the number of repeated questions as well as allow the community
to review and update the answers. The latest version of the complete
perlfaq is at http://faq.perl.org .


4.19: How do I validate input?

    (contributed by brian d foy)

    There are many ways to ensure that values are what you expect or want to
    accept. Besides the specific examples that we cover in the perlfaq, you
    can also look at the modules with "Assert" and "Validate" in their
    names, along with other modules such as "Regexp::Common".

    Some modules have validation for particular types of input, such as
    "Business::ISBN", "Business::CreditCard", "Email::Valid", and


The perlfaq-workers, a group of volunteers, maintain the perlfaq. They
are not necessarily experts in every domain where Perl might show up,
so please include as much information as possible and relevant in any
corrections. The perlfaq-workers also don't have access to every
operating system or platform, so please include relevant details for
corrections to examples that do not work on particular platforms.
Working code is greatly appreciated.

If you'd like to help maintain the perlfaq, see the details in

Site Timeline