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From: Zefram <zefram@fysh.org>
To: Peter Stephenson <pws@cambridgesiliconradio.com>
Cc: Zsh hackers list <zsh-workers@sunsite.auc.dk>
Subject: Re: PATCH: fix for (#s) and (#e) in param substs
Date: Fri, 14 Apr 2000 13:00:58 +0100 (BST)	[thread overview]
Message-ID: <E12g4mQ-0002EY-00@crucigera.fysh.org> (raw)
In-Reply-To: <0FT000MKM7T8D3@la-la.cambridgesiliconradio.com> from Peter Stephenson at "Apr 14, 2000 12:27:09 pm"

Peter Stephenson wrote:
>By the way, I inserted a hostage to fortune in the manual by claiming that
>`(^(#s))' etc. also work, i.e. you can assert that you are not at the start
>of the string.

Careful.  If that's been implemented correctly, `(^(#s))' will match
an arbitrarily long substring anywhere, in addition to a zero-length
substring anywhere other than the start of the string.  The semantics of
negation mean that it will match any substring other than what `(#s)'
will match; i.e., it will match anything except for a zero-length
substring at the start of the string.  The documentation should be made
clearer on this point.  We could also do with proper negative anchors,
that will match only a zero-length string in places other than the
{start,end} of the string.  Or if someone feels like implementing my
generalised anchors proposal (I don't have the time at the moment), then
`(#Aan:...)' could be used to negate the sense of an anchor.

-zefram


  parent reply	other threads:[~2000-04-14 12:02 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2000-04-14 11:27 Peter Stephenson
2000-04-14 11:42 ` Andrej Borsenkow
2000-04-14 12:15   ` Peter Stephenson
2000-04-14 12:00 ` Zefram [this message]
2000-04-14 13:03   ` Peter Stephenson

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