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Meaning of \C-? in bracket regular expression


From: Joe Riel
Subject: Meaning of \C-? in bracket regular expression
Date: Sun, 27 Sep 2015 16:49:55 -0700

What is the meaning of the elisp regular expression

 "[^\C-?}]"

Specifically, the "\C-?".  Is that a range? 
Then what character is \C?  
Or is it something else?

-- 
Joe Riel




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