The support for ?PATTERN? matching was removed in Perl 5.22.0, four years ago. You will need to use a matching operator and operand, like $_ =~ ?(^neuro.*)?. You will need to use a prefixed m, as choroba and Eily show.

In the perldelta, you can read what changed between each version of Perl 5.

In reply to Re: regexp "?" delimiter by Corion
in thread regexp "?" delimiter by cmic

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