From: Rudolf Sykora <rudolf.sykora@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] awk help; not plan9 matter
Date: Thu, 17 Sep 2009 22:33:40 +0200 [thread overview]
Message-ID: <a560a5d00909171333t467418c6w8e03756dc5808869@mail.gmail.com> (raw)
In-Reply-To: <df49a7370909171034l1f530e16kae9d2b40077e905a@mail.gmail.com>
2009/9/17 roger peppe <rogpeppe@gmail.com>:
> just change the regexp as required.
Ok. I decided (although just for game now) to play a little with the
idea of building the regexp.
Starting from Eric's post I slowly progressed to sth. quite similar to
your post :) :
fn buildre {
re = 's:^([ ]*)('
for(i in `{seq 1 `{hoc -e $1-1}})
re = $re ^ '[^ ]+[ ]+'
re = $re ^ ')[^ ]+:\1\2' ^ $2:
}
This works (even takes care about leading spaces) unless I want to use
it for the 1st field. Then the produced regexp (buildre 1 hell)is
s:^([ ]*)()[^ ]+:\1\2hell:
and sed says
sed: Command garbled: s:^([ ]*)()[^ ]+:\1\2hell:
Apparently it dislikes the empty group, (). Is there any reason?
I tried it in linux, there with
echo '1 28 3' | sed 's:^\([ ]*\)\(\)[^ ][^ ]*:\1\2hell:'
and it works as expected...
Thanks
Ruda
next prev parent reply other threads:[~2009-09-17 20:33 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-17 8:23 Rudolf Sykora
2009-09-17 8:37 ` matt
2009-09-17 8:52 ` Rudolf Sykora
2009-09-17 9:04 ` matt
2009-09-17 9:12 ` Rudolf Sykora
2009-09-17 10:42 ` Rudolf Sykora
2009-09-17 12:35 ` yy
2009-09-17 12:55 ` Rudolf Sykora
2009-09-17 15:51 ` Lyndon Nerenberg - VE6BBM/VE7TFX
2009-09-17 16:02 ` erik quanstrom
2009-09-17 16:20 ` roger peppe
2009-09-17 16:55 ` Rudolf Sykora
2009-09-17 17:04 ` erik quanstrom
2009-09-17 17:10 ` erik quanstrom
2009-09-17 17:19 ` Rudolf Sykora
2009-09-17 17:34 ` roger peppe
2009-09-17 20:33 ` Rudolf Sykora [this message]
2009-09-17 20:46 ` erik quanstrom
2009-09-17 21:09 ` Rudolf Sykora
2009-09-17 21:22 ` Rudolf Sykora
2009-09-17 21:24 ` erik quanstrom
2009-09-17 14:16 ` Noah Evans
2009-09-17 14:45 ` roger peppe
2009-09-17 17:03 ` Rudolf Sykora
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