From d07658376f6b05c85ca0763fb06a610a9211fb77 Mon Sep 17 00:00:00 2001 From: Eric Wong Date: Wed, 2 Oct 2019 19:32:42 +0000 Subject: [PATCH] HACKING: document Perl character class gotcha It took me years to discover this change in Perl 5.6, maybe other potential hackers are in the same boat. --- HACKING | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/HACKING b/HACKING index f7cb92e9..666d504e 100644 --- a/HACKING +++ b/HACKING @@ -50,3 +50,11 @@ requirements. See design_www.txt and design_notes.txt in the Documentation/ directory for design decisions made during development. + +Perl notes +---------- + +* \w, \s, \d character classes all match Unicode characters; + so write out class ranges (e.g "[0-9]") if you only intend to + match ASCII. Do not use the "/a" (ASCII) modifier, that requires + Perl 5.14 and we're only depending on 5.10.1 at the moment. -- 2.50.0