Date: Sat, 14 Feb 1998 09:10:02 -0800 (PST) From: Oliver Fromme <oliver.fromme@heim3.tu-clausthal.de> To: freebsd-bugs Subject: Re: docs/5708: Small bug in re_format(7) manual page. Message-ID: <199802141710.JAA13751@hub.freebsd.org>
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The following reply was made to PR docs/5708; it has been noted by GNATS.
From: Oliver Fromme <oliver.fromme@heim3.tu-clausthal.de>
To: sprice@hiwaay.net (Steve Price)
Cc: freebsd-gnats-submit@freebsd.org, oliver.fromme@heim3.tu-clausthal.de
Subject: Re: docs/5708: Small bug in re_format(7) manual page.
Date: Sat, 14 Feb 1998 18:05:28 +0100 (MET)
Steve Price wrote:
> >Description
> >
> > According to the re_format() manual page:
> >
> > Obsolete (``basic'') regular expressions differ in several
> > respects. `|', `+', and `?' are ordinary characters and
> > there is no equivalent for their functionality.
> >
> > This is not completely correct. `x+' is equivalent to `xx*' or
> > `x\{1,\}', and `x?' is equivalent to `x\{0,1\}'.
>
> Actually what the manpage says is correct. 'man 3 regex' and
> you will see REG_BASIC. If (cflags & REG_BASIC) is non-zero in a
> call regcomp(3), then the |, +, and ? characters are not expanded.
> They are only treated special when (cflags & REG_EXTENDED) is
> non-zero in a call to regcomp(3).
That is NOT the bug that I was reporting. The manpage IS
incorrect in saying that there is no equivalent for the
functionality of "+" and "?" in basic REs. I'm sorry if
my description wasn't clear enough.
"+" in extended REs is equivalent to "\{1,\}" in basic REs,
and "?" in extended REs is equivalent to "\{0,1\}" in basic
REs. I think that I expressed this quite clear in the diff
that I included with my PR.
Should I re-open this with another PR, or can we get it
fixed without that?
Regards
Oliver
--
Oliver Fromme, Leibnizstr. 18-61, 38678 Clausthal, Germany
(Info: finger userinfo:olli@dorifer.heim3.tu-clausthal.de)
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