replace e flag works in command but fails if that command in key mapping

The e option in

:s/\<[a-z]/\u&/ge

duly suppresses the error message if used as a command, but fails when used
in the following key mapping in .vimrc

" Type ;c to ConcatenateTitles and accumulate them in register z
:map ;c :s/\<[a-z]/\u&/ge<CR>:s/[ ,.;:'"]//ge<CR>"Zyy

producing "E486: Pattern not found: \<[a-z]" and failing to complete the
command string

Why different?

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