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Date: Mon, 1 Jul 2013 15:37:17 -0400
From: Phil Pennock <zsh-workers+phil.pennock@spodhuis.org>
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]'?
Message-ID: <20130701193717.GA15681@redoubt.spodhuis.org>
Mail-Followup-To: TJ Luoma <luomat@gmail.com>,
	Zsh-Users List <zsh-users@zsh.org>
References: <E2BB9B64-ECE8-4B69-BEEB-05B010699AB4@gmail.com>
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In-Reply-To: <E2BB9B64-ECE8-4B69-BEEB-05B010699AB4@gmail.com>

On 2013-07-01 at 13:59 -0400, TJ Luoma wrote:
> Before I reinvent the wheel, I thought I'd ask if someone already had 
> (or knew of) a way to take a string of characters and output a 'case 
> insensitive' regex version.
> 
> For example, if I input 'CrashPlan' I'd want to get out 
> [C|c][R|r][A|a][S|s][H|h][P|p][L|l][A|a][N|n]

% 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]
%

If this is for use within zsh, then as ZyX suggests it's simpler, even
for regexp cases:

 setopt rematch_pcre
 [[ "cRAShpLAn" =~ (?i)$foo ]]

-Phil