WRT non-ASCII matching check perlre for the /a modifier (and friends) which can affect what classes match w/o changing the regex itself.

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

In reply to Re^4: Unescaped left brace in regex is passed through in regex by Fletch
in thread Unescaped left brace in regex is passed through in regex by gzh

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