in reply to Re^3: Unescaped left brace in regex is passed through in regex
in thread Unescaped left brace in regex is passed through in regex

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 Section Seekers of Perl Wisdom