but only marginally faster in blead perl
From 5.30.0 perldelta: 
Regular expression pattern matching of things like C<qr/[^I<a>]/> is
significantly sped up, where I<a> is any ASCII character.  Other class
+es
can get this speed up, but which ones is complicated and depends on th
+e
underlying bit patterns of those characters, so differs between ASCII
and EBCDIC platforms, but all case pairs, like C<qr/[Gg]/> are include
+d,
as is C<[^01]>.

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Dave.

In reply to Re^2: opposite of index+rindex? How-to? Needed? by dave_the_m
in thread opposite of index+rindex? How-to? Needed? by perl-diddler

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