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* [PATCH] HACKING: document Perl character class gotcha
@ 2019-10-02 19:32 Eric Wong
  0 siblings, 0 replies; only message in thread
From: Eric Wong @ 2019-10-02 19:32 UTC (permalink / raw)
  To: meta

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


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2019-10-02 19:32 [PATCH] HACKING: document Perl character class gotcha Eric Wong

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