From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@quanstro.net>
Date: Fri, 11 Jan 2013 09:24:05 -0500
To: 9fans@9fans.net
Message-ID: <b628c3fe860d2900eaac0867c4f50f91@brasstown.quanstro.net>
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References: <CAM6ozu5TrRihh9Q-2Y9Fo7Raqo0OOzQ1umgE07AHddVR247Wnw@mail.gmail.com>
	<CAOEdRO14t_zLS5Z9pQ7LQUA+kya8DADUDmsgCCukx_sMGtB6Dg@mail.gmail.com>
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Subject: Re: [9fans] How to do this with [acme | sam | sed ] ?
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> # remove outermost pair of braces:  abcd(x+(y-z))efgh  --> abcdx+(y-z)e=
fgh
>          [ no idea :-( ]

this is made simple since * is "greedy":

Edit s:\((.*)\):\1:g

On Fri Jan 11 06:45:39 EST 2013, rudolf.sykora@gmail.com wrote:
> On 11 January 2013 12:19, Peter A. Cejchan <tyapca7@gmail.com> wrote:
> > # remove outermost pair of braces:  abcd(x+(y-z))efgh  --> abcdx+(y-z=
)efgh
>=20
> This, I believe, can't be achieved only with regexps. I'd write a
> small external program and use it as a filter.
>=20
> > # prefix to postfix operator: ++i --> i++
> >          [ Edit s/\+\+[a-zA-Z]+[0-9a-zA-Z]*/&++/ Edit s/\+\+/d]
>=20
> using the \1 (used to be undocumented on plan9) may be sometimes easier
> Edit s/\+\+([A-Za-z]+[A-Za-z0-9])*/\1++/

should be "Edit s/\+\+([A-Za-z]+[A-Za-z0-9]*)/\1++/"

ideally one should include _ and =C2=A1-=EF=BF=BF.

- erik