-For now, one may optionally subscribe to the mailing list by
-sending an email to: meta+subscribe@public-inbox.org
-(and confirming). However, reading over the mailing list is
-the least reliable method of reading a public-inbox.
+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.