PERL5141DELTA(1)

💖 perl5141delta — the tea on what's new in perl v5.14.1 💖

okay bestie, gather round, because we're doing a whole manual page and honestly? it's giving ✨maintenance release✨. the manual name is perl5141delta and it lives in the Perl Programmers Reference Guide, and it is exactly what it sounds like: the glow-up notes. 🦋

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🌸 NAME 🌸

perl5141delta — what is new for perl v5.14.1 🎀

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✨ DESCRIPTION ✨

so this whole doc is just the receipts on the difference between the 5.14.0 release and the 5.14.1 release. that's it. that's the vibe. 💅

and like — if you're upgrading from something way older, say 5.12.0, bestie you gotta do your homework first: read perl5140delta first, because that one covers everything between 5.12.0 and 5.14.0. no skipping. 🙈

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👑 Core Enhancements 👑

No changes since 5.14.0. literally nothing. iconic of her to just. not. 🫶

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🔒 Security 🔒

No changes since 5.14.0. zero, zilch, nada. 💀

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😭 Incompatible Changes 😭

There are no changes intentionally incompatible with 5.14.0. and if any do exist? they're bugs, not features, and reports are welcome fr fr. 🐛

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🍓 Deprecations 🍓

There have been no deprecations since 5.14.0. nothing got cancelled this round. 💜

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🎀 Modules and Pragmata 🎀

💖 New Modules and Pragmata

None

🧚 Updated Modules and Pragmata

• B::Deparse — upgraded from version 1.03 to 1.04, and it did that to fix two regressions that snuck into Perl 5.14.0:
  • Deparsing of the glob operator and its diamond (<>) form now works again. [perl #90898] ✨
  • The presence of subroutines named :::: or :::::: no longer causes B::Deparse to hang. (not the vibes. fixed now. 💅)
• Pod::Perldoc — upgraded from version 3.15_03 to 3.15_04.
  • It corrects the search paths on VMS. [perl #90640]

🌈 Removed Modules and Pragmata

None

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📚 Documentation 📚

🌸 New Documentation

None

💜 Changes to Existing Documentation

perlfunc

• given, when and default are now listed in perlfunc. 💖
• Documentation for use now includes a pointer to if.pm.

perllol

• perllol has been expanded with examples using the new push $scalar syntax introduced in Perl 5.14.0. 🫶

perlop

• The explanation of bitwise operators has been expanded to explain how they work on Unicode strings. 🔥
• The section on the triple-dot or yada-yada operator has been moved up, as it used to separate two closely related sections about the comma operator. (she was literally standing in the middle of the group chat. moved. 💀)
• More examples for m//g have been added.
• The <<\FOO here-doc syntax has been documented. no cap.

perlrun

• perlrun has undergone a significant clean-up. Most notably, the -0x... form of the -0 flag has been clarified, and the final section on environment variables has been corrected and expanded. ✨

POSIX

• The invocation documentation for WIFEXITED, WEXITSTATUS, WIFSIGNALED, WTERMSIG, WIFSTOPPED, and WSTOPSIG was corrected. 🎀

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🔍 Diagnostics 🔍

The following additions or changes have been made to diagnostic output, including warnings and fatal error messages. For the complete list of diagnostic messages, see perldiag. 👑

💜 New Diagnostics

None

💜 Changes to Existing Diagnostics

None

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🛠️ Utility Changes 🛠️

None

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⚙️ Configuration and Compilation ⚙️

• regexp.h has been modified for compatibility with GCC's -Werror option, as used by some projects that include perl's header files. 🧚

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🧪 Testing 🧪

• Some test failures in dist/Locale-Maketext/t/09_compile.t that could occur depending on the environment have been fixed. [perl #89896]
• A watchdog timer for t/re/re.t was lengthened to accommodate SH-4 systems which were unable to complete the tests before the previous timer ran out. ⏰ (she needed a lil more time. valid.)

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🌍 Platform Support 🌍

💫 New Platforms

None

💫 Discontinued Platforms

None

💫 Platform-Specific Notes

Solaris ☀️

• Documentation listing the Solaris packages required to build Perl on Solaris 9 and Solaris 10 has been corrected.

Mac OS X 🍎

• The lib/locale.t test script has been updated to work on the upcoming Lion release. 🦁
• Mac OS X specific compilation instructions have been clarified.

Ubuntu Linux 🐧

• The ODBM_File installation process has been updated with the new library paths on Ubuntu natty. 🍓

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🧬 Internal Changes 🧬

• The compiled representation of formats is now stored via the mg_ptr of their PERL_MAGIC_fm. Previously it was stored in the string buffer, beyond SvLEN(), the regular end of the string. SvCOMPILED() and SvCOMPILED_{on,off}() now exist solely for compatibility for XS code. The first is always 0, the other two now no-ops. 💅

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🐛 Bug Fixes 🐛

• A bug has been fixed that would cause a Use of freed value in iteration error if the next two hash elements that would be iterated over are deleted. [perl #85026]
• Passing the same constant subroutine to both index and formline no longer causes one or the other to fail. [perl #89218]
• 5.14.0 introduced some memory leaks in regular expression character classes such as [\w\s], which have now been fixed. 🔥
• An edge case in regular expression matching could potentially loop. This happened only under /i in bracketed character classes that have characters with multi-character folds, and the target string to match against includes the first portion of the fold, followed by another character that has a multi-character fold that begins with the remaining portion of the fold, plus some more.

"s\N{U+DF}" =~ /[\x{DF}foo]/i

is one such case. \xDF folds to ss. 😭

• Several Unicode case-folding bugs have been fixed.
• The new (in 5.14.0) regular expression modifier /a when repeated like /aa forbids the characters outside the ASCII range that match characters inside that range from matching under /i. This did not work under some circumstances, all involving alternation, such as:

"\N{KELVIN SIGN}" =~ /k|foo/iaa;

succeeded inappropriately. This is now fixed. ✨

• Fixed a case where it was possible that a freed buffer may have been read from when parsing a here document.

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🫶 Acknowledgements 🫶

Perl 5.14.1 represents approximately four weeks of development since Perl 5.14.0 and contains approximately 3500 lines of changes across 38 files from 17 authors. (four weeks!! the dedication!! 😭)

Perl continues to flourish into its third decade thanks to a vibrant community of users and developers. The following people are known to have contributed the improvements that became Perl 5.14.1:

Bo Lindbergh, Claudio Ramirez, Craig A. Berry, David Leadbeater, Father Chrysostomos, Jesse Vincent, Jim Cromie, Justin Case, Karl Williamson, Leo Lapworth, Nicholas Clark, Nobuhiro Iwamatsu, smash, Tom Christiansen, Ton Hospel, Vladimir Timofeev, and Zsbán Ambrus. 👑💖

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🐞 Reporting Bugs 🐞

If you find what you think is a bug, you might check the articles recently posted to the comp.lang.perl.misc newsgroup and the perl bug database at http://rt.perl.org/perlbug/ . There may also be information at http://www.perl.org/ , the Perl Home Page.

If you believe you have an unreported bug, please run the perlbug program included with your release. Be sure to trim your bug down to a tiny but sufficient test case. Your bug report, along with the output of perl -V, will be sent off to perlbug@perl.org to be analysed by the Perl porting team. 🫡

If the bug you are reporting has security implications, which make it inappropriate to send to a publicly archived mailing list, then please send it to perl5-security-report@perl.org. This points to a closed subscription unarchived mailing list, which includes all the core committers, who be able to help assess the impact of issues, figure out a resolution, and help co-ordinate the release of patches to mitigate or fix the problem across all platforms on which Perl is supported. Please only use this address for security issues in the Perl core, not for modules independently distributed on CPAN.

ok bestie listen, if it's a security thing, do NOT just post it in the public group chat. that address is the locked private chat, and it's for Perl core only — not for random CPAN modules doing their own thing. iykyk. 🔒

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👀 SEE ALSO 👀

The Changes file for an explanation of how to view exhaustive details on what changed.

The INSTALL file for how to build Perl.

The README file for general stuff.

The Artistic and Copying files for copyright information.

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and that's the whole thing, bestie! 🌈 this lil page is from perl v5.42.3, dated 2026-08-03 — so yeah, we're reading the old tea with new eyes. slay, stay hydrated, and always trim your bug reports down to a tiny but sufficient test case. periodt. 💅🎀🦋