Not completely sure but I believe that in order to get [:alpha:] to grok accented characters you also need to use the locale pragma (in addition to utf8 as you've done).

The cake is a lie.
The cake is a lie.
The cake is a lie.

In reply to Re: Why [[:alpha:]] doesn't involve diacritic characters in replace expression? by Fletch
in thread Why [[:alpha:]] doesn't involve diacritic characters in replace expression? by wk

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