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From: Eric Wong <e@80x24.org>
To: meta@public-inbox.org
Subject: [PATCH] HACKING: document Perl character class gotcha
Date: Wed,  2 Oct 2019 19:32:42 +0000	[thread overview]
Message-ID: <20191002193242.8674-1-e@80x24.org> (raw)

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.
-- 
EW


                 reply	other threads:[~2019-10-02 19:32 UTC|newest]

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