* Re: non-greedy matching? [not found] <20010321142303.B8924@thelonious.new.ox.ac.uk> @ 2001-03-21 15:52 ` Peter Stephenson 2001-03-21 16:02 ` Peter Stephenson 2001-03-21 23:00 ` Adam Spiers 1 sibling, 1 reply; 5+ messages in thread From: Peter Stephenson @ 2001-03-21 15:52 UTC (permalink / raw) To: Zsh hackers list Adam Spiers <adam@spiers.net> wrote: > They are done in order to strip control characters from a prompt so > that its display width can be determined. At first I thought that it > would surely be easy to avoid this, but I still haven't come up with a > quick replacement, since neither zsh nor sed seem to be able to do > non-greedy matching. You can, it's in the manual. % foo='%{one%}hello%{two%}' % print ${(S)foo//[%]\{*[%]\}} hello Don't ask me why you need to put the `%' in square brackets --- there may be some stray (s)printf in the code, for example. (Do tell me if you know what it is.) -- Peter Stephenson <pws@csr.com> Software Engineer CSR Ltd., Unit 300, Science Park, Milton Road, Cambridge, CB4 0XL, UK Tel: +44 (0)1223 392070 ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: non-greedy matching? 2001-03-21 15:52 ` non-greedy matching? Peter Stephenson @ 2001-03-21 16:02 ` Peter Stephenson 0 siblings, 0 replies; 5+ messages in thread From: Peter Stephenson @ 2001-03-21 16:02 UTC (permalink / raw) To: Zsh hackers list > % foo='%{one%}hello%{two%}' > % print ${(S)foo//[%]\{*[%]\}} > hello > > Don't ask me why you need to put the `%' in square brackets --- there may > be some stray (s)printf in the code, for example. (Do tell me if you know > what it is.) I just realised: //% means match only at the end. % print ${(S)foo//\\%\{*[%]\}} also works. I always loathed that syntax: it's unmemorable and hacky (all right, it's not on its own). -- Peter Stephenson <pws@csr.com> Software Engineer CSR Ltd., Unit 300, Science Park, Milton Road, Cambridge, CB4 0XL, UK Tel: +44 (0)1223 392070 ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: non-greedy matching? [not found] <20010321142303.B8924@thelonious.new.ox.ac.uk> 2001-03-21 15:52 ` non-greedy matching? Peter Stephenson @ 2001-03-21 23:00 ` Adam Spiers 2001-03-22 0:09 ` Bart Schaefer 1 sibling, 1 reply; 5+ messages in thread From: Adam Spiers @ 2001-03-21 23:00 UTC (permalink / raw) To: Zsh hackers list Peter Stephenson (pws@csr.com) wrote: > Adam Spiers <adam@spiers.net> wrote: > > They are done in order to strip control characters from a prompt so > > that its display width can be determined. At first I thought that it > > would surely be easy to avoid this, but I still haven't come up with a > > quick replacement, since neither zsh nor sed seem to be able to do > > non-greedy matching. > > You can, it's in the manual. > > % foo='%{one%}hello%{two%}' > % print ${(S)foo//[%]\{*[%]\}} > hello *gobsmacked* I think that's the least uncomfortable I've ever felt after being RTFM'd, given that you're apparently the only -worker who remembered if that flag's existence ;-) Can I suggest that it be made slightly more self-evident in the manual, for instance via this patch? I would expect most people searching for this feature in the manual to use the keyword `greedy'. Index: Doc/Zsh/expn.yo =================================================================== RCS file: /cvsroot/zsh/zsh/Doc/Zsh/expn.yo,v retrieving revision 1.26 diff -u -r1.26 expn.yo --- Doc/Zsh/expn.yo 2001/03/12 17:39:24 1.26 +++ Doc/Zsh/expn.yo 2001/03/21 22:59:30 @@ -779,8 +779,8 @@ Search substrings as well as beginnings or ends; with tt(#) start from the beginning and with tt(%) start from the end of the string. With substitution via tt(${)...tt(/)...tt(}) or -tt(${)...tt(//)...tt(}), specifies that the shortest instead of the -longest match should be replaced. +tt(${)...tt(//)...tt(}), specifies non-greedy matching, i.e. that the +shortest instead of the longest match should be replaced. ) item(tt(I:)var(expr)tt(:))( Search the var(expr)th match (where var(expr) evaluates to a number). > I just realised: //% means match only at the end. > % print ${(S)foo//\\%\{*[%]\}} > also works. Is there no limit to what zsh can do? :-) ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: non-greedy matching? 2001-03-21 23:00 ` Adam Spiers @ 2001-03-22 0:09 ` Bart Schaefer 2001-03-22 10:32 ` Peter Stephenson 0 siblings, 1 reply; 5+ messages in thread From: Bart Schaefer @ 2001-03-22 0:09 UTC (permalink / raw) To: Zsh hackers list On Mar 21, 11:00pm, Adam Spiers wrote: } Subject: Re: non-greedy matching? } } Can I suggest that it be made slightly more self-evident in the } manual, for instance via this patch? I would expect most people } searching for this feature in the manual to use the keyword `greedy'. I don't think I would have thought of searching for "greedy" ... but then I obviously never thought of searching for it at all. And having this as a parameter expansion flag doesn't help when it comes to glob patterns, which is (I rationalize) why I never thought of searching for it. Anyone for adding another extendedglob flag? (#g)? (Maybe another letter would be better, since the flag would turn -off- greediness.) -- Bart Schaefer Brass Lantern Enterprises http://www.well.com/user/barts http://www.brasslantern.com Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: non-greedy matching? 2001-03-22 0:09 ` Bart Schaefer @ 2001-03-22 10:32 ` Peter Stephenson 0 siblings, 0 replies; 5+ messages in thread From: Peter Stephenson @ 2001-03-22 10:32 UTC (permalink / raw) To: Zsh hackers list Bart wrote: > And having this as a parameter expansion flag doesn't help when it > comes to glob patterns, which is (I rationalize) why I never thought > of searching for it. > > Anyone for adding another extendedglob flag? (#g)? (Maybe another > letter would be better, since the flag would turn -off- greediness.) It's not currently done in the globbing code, it's done by looping in the parameter code. It could be tricky to add directly. -- Peter Stephenson <pws@csr.com> Software Engineer CSR Ltd., Unit 300, Science Park, Milton Road, Cambridge, CB4 0XL, UK Tel: +44 (0)1223 392070 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2001-03-22 10:33 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <20010321142303.B8924@thelonious.new.ox.ac.uk> 2001-03-21 15:52 ` non-greedy matching? Peter Stephenson 2001-03-21 16:02 ` Peter Stephenson 2001-03-21 23:00 ` Adam Spiers 2001-03-22 0:09 ` Bart Schaefer 2001-03-22 10:32 ` Peter Stephenson
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