As viveksnv so helpfully points out, the LDAP interfaces in Perl are many and varied, with Net::LDAP leading the pack. However, it sounds like you are wanting more fundamental information, namely, "how do I query Active Directory using LDAP (and you're using ldapsearch command, not a Perl API)". That information seems to be carefully explained in an article in the "Hey, Scripting Guy!" blog on TechNet. Although that example uses Windows command line scripting (which if you're actually working with Active Directory you should be doing anyway, using the Microsoft tools that make such things easier than raw LDAP), it's easy enough to figure out the filters and proper values to query for. I also found an article describing how to use dsquery to do the same thing. If you're working with a newer A/D installation, you should check out Active Directory Administration using PowerShell from the folks at Microsoft. After all, they did create the system.
Update: Read your request too quickly, now see the very important from Linux in your post. Sorry about that. You can still use the Scripting Guy information to help you, though.