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- #!/usr/bin/env perl
- use warnings;
- use 5.014;
- use lib "/home/kaiyin/bin";
- use wrappers;
- # match a palindrome.
- my $s = "xyzyx";
- my $pp = qr/^ ( (\w) (?1) \g{-1} | \w? ) $/ix;
- say "yes" if $s =~ $pp;
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