On Tue, 13 May 2008, (HL, who wrote me off-list) wrote:
> Dan Singer wrote:
> > On Tue, 13 May 2008, Glenn Fowler wrote:
> >
> > > this will do it
> > > print "${buf/?(*$'\n')@(part5:*([^\n]))*/\2}"
> >
>
> Extended shell patterns use a kind of prefix notation
>
> prefix lparen shell-patterns [ bar shell-pattern ] rparen
> ...
Ah, thanks (to you and David)! I had managed to space that out. It
all just looked very cryptic.
I ran into a similar problem a few months ago, and handled it somewhat
more awk-wardly (w/ prefix patterns, btw):
npat="[0-9][0-9]:[0-9][0-9]:[0-9][0-9]"
# extract the time string out of a line
function extract_time {
typeset tstr="$1"
typeset bstr estr
eval "bstr=\${tstr/%@($npat)*/}"
eval "estr=\${tstr/#*@($npat)/}"
tstr=${tstr#$bstr}
tstr=${tstr%$estr}
print -- "$tstr"
}
Good to know that there's a good one-liner to do the job. Let's see,
would that be
eval "print -- \"\${tstr/?(*)@(${npat})*/\2}\""
?? (seems to work)
--
Daniel E. Singer, System Administrator
Dept. of Computer Science, Duke University, Durham NC 27708 USA
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