2. Note that --enable-utf and --enable-ucp have been amalgamated into
--enable-unicode, and this is now the default.
While this seems reasonnable at the first look, linking of these
options has one unfortunate drawback: it dramatically changes the
semantics of \w, \W, \b etc. and previously working patterns over UTF
strings could produce different results.
If the two options remain merged, at least a (*NOUCP) possibility
should be offered to maintain backward compatibility.
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