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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <150309093718.ZM12425@torch.brasslantern.com>
Date: Mon, 9 Mar 2015 09:37:18 -0700
In-Reply-To: <20150308225336.GA2746@localhost.localdomain>
Comments: In reply to Han Pingtian <hanpt@linux.vnet.ibm.com>
        "Re: wrong array range with (r) flag on scalar?" (Mar  9,  6:53am)
References: <20150305083000.GA3294@localhost.localdomain> 
	<150305084408.ZM20963@torch.brasslantern.com> 
	<20150305170638.0d10ba1b@pwslap01u.europe.root.pri> 
	<20150308225336.GA2746@localhost.localdomain>
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To: zsh-workers@zsh.org
Subject: Re: wrong array range with (r) flag on scalar?
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On Mar 9,  6:53am, Han Pingtian wrote:
}
} Looks like this is also the case for (i):
} 
} localhost% foo=abcdefgh
} localhost% print $foo[(r)ab,(i)fg]
} abcdefg
} localhost%
} 
} Though 
} 
} localhost% print $foo[(i)fg]
} 6
} localhost%
} 
} But according to the new contents of manual, this is the same case as
} "(r)fg".

You can't use (i) in ranges.  $s[(i)ab,(i)fg] is an "invalid subscript";
the end of the range is not treated the same as the start.

So although $s[(r)fg] is the same as $s[$s[(i)fg]], $s[(r)ab,(r)fg] is
not the same as $s[$s[(i)ab],$s[(i)fg]].

The foregoing of course all applies only to indexes on scalars; for an
index on an array, the pattern match and resulting index values apply
to entire array elements, so there are no substrings to extract.