From: ZyX <kp-pav@yandex.ru>
To: TJ Luoma <luomat@gmail.com>
Cc: Zsh-Users List <zsh-users@zsh.org>
Subject: Re: input foo, output '[F|f][O|o][O|o]'?
Date: Tue, 02 Jul 2013 07:51:20 +0400 [thread overview]
Message-ID: <215891372737080@web15e.yandex.ru> (raw)
In-Reply-To: <E7CF18D5-CB4B-4E80-B7E0-40D5930E42DD@gmail.com>
02.07.13, 04:58, "TJ Luoma" <luomat@gmail.com>":
>
>
> On 1 Jul 2013, at 14:44, ZyX wrote:
>
> > I do not think you will find a way to do this. All regex engines
> > (precisely, programs that are using them) I know support a way to set
> > case sensitivity for the whole regular expression and some support
> > toggling this for a part of regular expression. In grep this is an -i
> > switch, for vim it is either /i or \c/\C, for sed this is /i, for PCRE
> > and perl this is additionally (?i) "atom" (additionally to other ways
> > of toggling the behavior which are highly dependent on programs
> > embedding PCRE; for perl this is usual /i flag). Even zsh globs do
> > support (#i).
>
> Phil Pennock's version worked great:
>
> % foo=CrashPlan
> % for c in ${(s::)foo}; do print -n "[${(U)c}|${(L)c}]";done; print
> [C|c][R|r][A|a][S|s][H|h][P|p][L|l][A|a][N|n]
> %
This is a bicycle. You asked for a standard way, you will not find it.
>
>
> > By the way, what regex engine is your output for? Any I am aware of
> > parse "[N|n]" as "either one of three characters: N, n, or pipe".
>
> Really? I can think of several that support it. Maybe it's because I'm
> old enough to remember when a lot of these utilities didn't have 'ignore
> case'
>
> % echo "foo\nbar\nbat" | egrep -v '[F|f]'
> bar
> bat
>
> % echo "foo\nbar\nbat" | sed 's#[F|f][O|o][O|o]#XXX#g'
> XXX
> bar
> bat
>
> You can also use it for matching case/esac :
>
> case "$i" in
> [C|c][R|r][A|a][S|s][H|h][P|p][L|l][A|a][N|n])
> echo "matched crashplan"
> ;;
>
> *)
> echo "No Match"
> ;;
>
> esac
It is not a disproof. Check it with pipe symbol in input.
>
>
> > I am also assuming XY problem here: what for do you need such
> > conversion? You should consider lowercasing the tested string if
> > nothing like -i is available.
>
> It's for use with the AddDescription directive for .htaccess which (from
> what I understand) takes its case sensitivity from the underlying
> filesystem when matching filenames. There's no "ignore case" flag or
> anything else that I can use with it, so my only option (at least, the
> only one I can think of) is the one that I suggested. For example, if I
> wanted to add this for any files which start with 'BBEdit' (case
> insensitive) this is what I'd need to use:
>
> AddDescription "<a href='http://barebones.com/bbedit'>A text editor
> that doesn't suck</a>" [B|b][B|b][E|e][D|d][I|i][T|t]*
>
> I verified that it works, but typing that stuff manually is tedious and
> highly error prone, which made it the perfect place for a shell script
> :-)
Unless AddDescription uses different regex engine then FilesMatch answer is in the first link if searching for "htaccess case insensitive regex": (?i:pattern).
next prev parent reply other threads:[~2013-07-02 4:02 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-01 17:59 TJ Luoma
2013-07-01 18:44 ` ZyX
2013-07-02 0:58 ` TJ Luoma
2013-07-02 1:30 ` Lawrence Velázquez
2013-07-02 1:53 ` Benjamin R. Haskell
2013-07-02 4:24 ` TJ Luoma
2013-07-02 3:51 ` ZyX [this message]
2013-07-02 4:00 ` ZyX
2013-07-02 23:24 ` Phil Pennock
2013-07-01 19:37 ` Phil Pennock
2013-07-02 0:24 ` TJ Luoma
2013-07-01 23:51 ` Alex Satrapa
2013-07-02 0:38 ` Kurtis Rader
2013-07-02 1:11 ` TJ Luoma
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