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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <140515101627.ZM30581@torch.brasslantern.com>
Date: Thu, 15 May 2014 10:16:27 -0700
In-reply-to: <20140515163745.GJ1629@isis.sigpipe.cz>
Comments: In reply to Roman Neuhauser <neuhauser@sigpipe.cz>
 "Re: ${name/pattern/repl} with negated pattern" (May 15,  6:37pm)
References: <20140515122641.GI1629@isis.sigpipe.cz>
	<140515084550.ZM30494@torch.brasslantern.com>
	<20140515163745.GJ1629@isis.sigpipe.cz>
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Subject: Re: ${name/pattern/repl} with negated pattern
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On May 15,  6:37pm, Roman Neuhauser wrote:
}
}     ${name/pattern/repl}
}     ${name//pattern/repl}
}       [...]
}       The pattern may begin with a `#', in which case the pattern must
}       match at the start of the string, or `%', in which case it must
}       match at the end of the string, or `#%' in which case the pattern
}       must match the entire string.

Indeed, I'd forgotten about that.  Still:

torch% setopt extendedglob
torch% torch% echo #foo
zsh: bad pattern: #foo
torch% print ${a:##foo}

torch% 

Evidently the syntax allowing the pattern to begin with a "#" is applied
in the name:# case as well as in the name/ case, even though it should
be meaningless for :#.