Category Archives: perl

Perl v5.32 New Features

Perl v5.32 is around the corner and it has some interesting new features. The previous major releases focussed more on finally removing deprecations and shoring up odd cases, and you still find a few of those in this release. Full details, as always, are in the perldelta, and nothing is guaranteed until Perl v5.31 turns […]

Use the infix class instance operator

Perl v5.32 adds Paul Evans’s infix isa operator—the “class instance operator”. One of the delightful things to note about this is addition is that it is one of the features whose development took place almost entirely through a GitHub issue and pull request. GitHub is now the primary repository for the Perl code, and has […]

No more false postfix lexical declarations in v5.30

Before Perl v5.10 introduced state variables, people did various things to create persistent lexical variables for a subroutine. With v5.30, one of those constructs is now a fatal error. Often you want a persistent variable to be scoped and private to a subroutine. But, once you leave that scope, normal lexical variables disappear because their […]

Perl v5.30 new features

Perl v5.29 is the development series leading up to the maintenance release v5.30 sometime in the middle of 2019. As it’s released—roughly monthly—you can get a peek at what’s coming up. You can track the progress by reading the perldelta documentation that comes with each Perl release (although you’ll need to select the development version […]

Perl v5.30 lets you match more with the general quantifier

Does the {N,} really match infinite repetitions in a Perl regular expression? No, it never has. You’ve been limited to 32,766 repetitions. Perl v5.30 is about to double that for you. And, if you are one of the people who needed more, I’d like to hear your story.

Use @{^CAPTURE} to get a list of all the capture buffers

Perl v5.26 adds three new special variables related to captures. The @{^CAPTURE} is an array of all the capture buffers. %{^CAPTURE} is a alias for %+ and stores the actually-matched named capture labels as its keys. %{^CAPTURE_ALL} is an alias for %- and stores all the named capture labels and their matched (or not) values.

Mix assignment and reference aliasing with declared_refs

Perl v5.26 adds the experimental declared_refs feature that expands on the experimental refaliasing feature from v5.22. As with all experimental features, this may change or disappear according to perlpolicy.

Use Unicode 10 in Perl v5.28

Perl v5.28 updates to Unicode 10. There are 8,518 new characters, 7,473 which are in the CJK extension. There are 56 new emojis. And, the Bitcoin symbol, ₿. It adds a T. rex, 🦖, but we’re still waiting for a raptor. To Perl they are just characters like any other so you don’t need anything […]

Find the new emojis in Perl’s Unicode support

Perl v5.26 updates itself to Unicode 9. That’s not normally exciting news but people have been pretty enthusiastic about the 72 new emojis that come. As far as Perl cares, they are just valid code points like all of the other ones.

Perl v5.28 can delete key-value slices

Perl v5.20 introduced key-value slices that worked on hashes and arrays. You could extract values by their keys or indices as well as assigning to those. The key-value slice delete is way to extract the keys and values you want and delete them at the same time. You can destructively