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
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.