=item *
-Certain regex patterns involving a complemented posix class in an
+Certain regex patterns involving a complemented POSIX class in an
inverted bracketed character class, and matching something else
optionally would improperly fail to match. An example of one that could
fail is C</qr/_?[^\Wbar]\x{100}/>. This has been fixed.
[perl #127537]
+=item *
+
+Perl 5.22 added support to the C99 hexadecimal floating point notation,
+but sometimes misparses hex floats. This had been fixed.
+[perl #127183]
+
=back
=head1 Known Problems