Just wanted to share why using qr// to store regexes is usually a better idea than using strings...

Today I was told to debug why a night batch failed to complete in the last weeks ...

As it turned out filenames where checked with a list of hardcoded regexes and one of them had a typo. Instead of filter => ".*pl|.*txt" it had ".*pl|*.txt" which was hard to spot among many other regexes and caused a runtime error.

Now using qr would have caused filter => qr/.*pl|*.txt/ to fail immediately at compile time.

And since my colleagues use Komodo which runs perl -c at background (aka flymake-mode in emacs) this would have meant noticing the typo instantly while editing.

HTH!

PS: not wanna talk about the other flaws, like why extensions are checked with handcrafted regexes or why exitcodes from batches weren't checked...