Match the ASCII text string of the form ^Xwith a template \^., nothing more. Match the ASCII text string of the form \^Xto the template \\\^.. You can limit this point to [?@_\[\]^\\], therefore \\\^[A-Z?@_\[\]^\\]. It is easier to read [?\x40-\x5F]for a copied character class, therefore, \\\^[?\x40-\x5F]for the BACKSLASH literal, followed by the literal CIRCUMFLEX, followed by something that turns into one of the valid control characters.
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, \pC GC = Other \p{Cc} GC = Control.