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Date: Sun, 29 Nov 2015 07:24:54 -0800
From: Ray Andrews <rayandrews@eastlink.ca>
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To: Zsh Users <zsh-users@zsh.org>
Subject: lexing
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Gentlemen:

The syntax highlighting in my editors makes the predictable mistake when 
it bumps into these:

(#b)
(#c1,2)
(#a3)

because the lexing mostly follows bash rules.  The people who write the 
highlighter are interested in fixing that for zsh, but they want a 
rigorous description of the rule.  As far as I know the only rule there 
is that if the hash is preceded by an open parenthesis then it is not a 
comment.  Is that sufficient or are there further subtleties?