Date: Sat, 14 Feb 1998 08:50:03 -0800 (PST) From: Steve Price <sprice@hiwaay.net> To: freebsd-bugs Subject: Re: docs/5708: Small bug in re_format(7) manual page. Message-ID: <199802141650.IAA12441@hub.freebsd.org>
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The following reply was made to PR docs/5708; it has been noted by GNATS.
From: Steve Price <sprice@hiwaay.net>
To: freebsd-gnats-submit@freebsd.org, oliver.fromme@heim3.tu-clausthal.de
Cc: Subject: Re: docs/5708: Small bug in re_format(7) manual page.
Date: Sat, 14 Feb 1998 10:50:02 -0600
>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).
Steve
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