[PATCH] www: support `+' in inbox names

[Eric Wong]

`+' already seemed to works for IMAP mailboxes and NNTP newsgroup
names and git-config doesn't complain, either.  So allow it as
the path components of WWW URLs so projects like `libstdc++' can
use it.

Reported-by: Mark Wielaard <mark@klomp.org>
Tested-by: Mark Wielaard <mark@klomp.org>
Link: https://public-inbox.org/meta/YwKnFCvganW7ErXU@wildebeest.org/
---
 There should be better test coverage for this at some point,
 but I suppose this is good enough for now as I'm hacking on
 a more interesting part of this project :>

 lib/PublicInbox/WWW.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/PublicInbox/WWW.pm b/lib/PublicInbox/WWW.pm
index 755d7558..a33709e9 100644
--- a/lib/PublicInbox/WWW.pm
+++ b/lib/PublicInbox/WWW.pm
@@ -23,7 +23,7 @@ use PublicInbox::WwwStatic qw(r path_info_raw);
 use PublicInbox::Eml;
 
 # TODO: consider a routing tree now that we have more endpoints:
-our $INBOX_RE = qr!\A/([\w\-][\w\.\-]*)!;
+our $INBOX_RE = qr!\A/([\w\-][\w\.\-\+]*)!;
 our $MID_RE = qr!([^/]+)!;
 our $END_RE = qr!(T/|t/|t\.mbox(?:\.gz)?|t\.atom|raw|)!;
 our $ATTACH_RE = qr!([0-9][0-9\.]*)-($PublicInbox::Hval::FN)!;