From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Thu, 17 Sep 2009 23:09:50 +0200
Message-ID: <a560a5d00909171409g6425c9feu239ac381b1e813a3@mail.gmail.com>
From: Rudolf Sykora <rudolf.sykora@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] awk help; not plan9 matter
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2009/9/17 erik quanstrom <quanstro@quanstro.net>:
> i don't think you need an extra () for the leading
> white space. =A0just tack it on in with the leading expression.

see below

> the hoc is unnecessary. =A0just start with 2.
true :)

> fn buildre {
> =A0 =A0 =A0 =A0re =3D 's:^([ =A0 =A0 ]*'
> =A0 =A0 =A0 =A0for(i in `{seq 2 $1})
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0re =3D $re ^ '[^ =A0]+[ =A0 =A0 ]+'
> =A0 =A0 =A0 =A0re =3D $re ^ ')([^ =A0 =A0 =A0 =A0]+):\1' ^ $2:
> }
>
> ; buildre 1 hell
> ; whatis re
> re=3D's:^([ =A0 =A0 =A0 ]*)([^ =A0]+):\1hell:'

already here is a problem:
1) I am to save the leading space --- so it shouldn't be an argument to s.
2) only the 2nd () --- the word with no spaces in itself --- is to be chang=
ed
... since the spaces are to be preserved, none of them should be an
argument to the s command, I think. That's why it was treated
seperately by me.

Anyway, what do you think about that problem with the empty group? Why
linux is ok with it while plan 9 is not? Is there any reason? Is that
a bug in plan9 sed?

Thanks
Ruda

> ; buildre 2 hell
> ; whatis re
> re=3D's:^([ =A0 =A0 =A0 ]*[^ =A0 =A0]+[ =A0 =A0 ]+)([^ =A0]+):\1hell:'
>
> - erik
>
>