From: John Maddock (john_at_[hidden])
Date: 2007-08-13 12:32:29
Raffaele Romito wrote:
> Thanks for the reply John, I'll try to expose my "use case" with the
> hope this feature will be available in the future...
> I'm developing a system that detects TCP streams with a pattern
> matching, here is the pseudo code (in a simplified form) of the
> function I'd link to extend:
>
> protocol_stream decodeStream(tcp_stream)
> {
> foreach(registered protocol in the system)
> {
> required_size_to_match =
> calc_min_regex_len(current_protocol.regex);
>
> if(tcp_stream.buffer_size <= required_size_to_match)
> check if tcp_stream.buffer matches
> else
> try to read from tcp_stream if data is available until
> <required_size_to_match> and check again if matches
> }
> }
>
> Hope u can help since you have "an almost pathological interest in
> anything that can't be done" :)
Oh dear, I should have realised that this would come back to haunt me ! :-0
I've now realised that in the general case this can't in fact be implemented
(think back-references), but can be for at least a subset of regexes. If
you're still keen on the feature can you please file a feature request on
the TRAC (http://svn.boost.org/trac) so this doesn't get lost?
Thanks, John.