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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <141111074407.ZM30753@torch.brasslantern.com>
Date: Tue, 11 Nov 2014 07:44:07 -0800
In-reply-to: <20141111125423.GA4343@chaz.gmail.com>
Comments: In reply to Stephane Chazelas <stephane.chazelas@gmail.com>
 "(#m) and "case" alternation" (Nov 11, 12:54pm)
References: <20141111125423.GA4343@chaz.gmail.com>
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To: Stephane Chazelas <stephane.chazelas@gmail.com>,
 Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: (#m) and "case" alternation
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On Nov 11, 12:54pm, Stephane Chazelas wrote:
}
} Some unexpected behaviour:
} 
} $ case abc in ((#m)a* | b*) echo $MATCH; esac

It shouldn't be unexpected, because it's documented:

m
     Set references to the match data for the entire string matched;
     this is similar to backreferencing and does not work in filename
     generation.  THE FLAG MUST BE IN EFFECT AT THE END OF THE PATTERN,
     i.e. NOT LOCAL TO A GROUP.

(all-caps mine).