How to make regexes faster? (Python v. OmniMark)

[Johannes Gijsbers]

Erno Kuusela <erno-news at erno.iki.fi> wrote in message news:<kulmbimohe.fsf at lasipalatsi.fi>...
 
> it doesn't show up in many newsreaders, because your message lacks a
> "references" header. that's the usual mechanism that newsreaders use
> to do threading. your message does have a "in-reply-to" header, which
> your newreader could be using. it's for mail and not news, so not
> standard.

Maybe the "in-reply-to" header should be used by the news/mail client
if there's no "references" header. The "in-reply-to" header is already
used to form the "references" header when replying(if no "references"
header is present), so why shouldn't it be used to thread? I know
there could be a problem with "in-reply-to" headers containing
multiple parents, but I'm sure the implementation could choose a
solution for that(using only one parent, or not threading at all).

Johannes