Does the 'o' modifier for Perl regular expressions still provide any benefit?

Question

It used to be considered beneficial to include the \'o\' modifier at the end of Perl regular expressions. The current Perl documentation does not even seem to list it, cert

Answer 1

In the Perl 5 version 20.0 documentation http://perldoc.perl.org/perlre.html it states

Modifiers

Other Modifiers

…

o - pretend to optimize your code, but actually introduce bugs

which may be a humorous way of saying it was supposed to perform some kind of optimisation, but the implementation is broken.

Thus the option might be best avoided.