Re: [9fans] non greedy regular expressions

[erik quanstrom <quanstro@quanstro.net>]

> But any manual page (regexp(6), that of sam)  keeps completely silent
> about eg. any submatch tracking.
> So what's wrong? Can anybody clarify the situation for me or do I
> really have to read the codes?

well reading the code would be a travesty.  it's curious
that neither the sam paper nor regexp(6) mentions
submatches.  maybe i missed them.

sed -n 's:.*(KRAK[A-Z]+*) +([a-zA-Z]+).*:\2, \1:gp' </lib/volcanoes

sam -d /lib/volcanoes
,x g/KRAK/ s:[^A-Z]+([A-Z]+*) +([a-zA-Z]+).*:\2, \1:
/KRAK/-+

or, if you want to run sam as a stream editor
{	echo ',x g/KRAK/ s:[^A-Z]+([A-Z]+*) +([a-zA-Z]+).*:\2, \1:'
	echo '/KRAK/-+'
} | sam -d /lib/volcanoes >[2=]

a couple of examples of submatch tracking from our system
(i'm not sure about the version of iwhois on sources.)

/rc/bin/B
/rc/bin/Kill
/rc/bin/broke
/rc/bin/fax
/rc/bin/fshalt
/rc/bin/iwhois
/rc/bin/juke

- erik