https://github.com/tokuhirom/p5-lingua-ja-kana/commit/43fe5a964c933b3a64373a60593450a4a231df8e Lingua::JA::Kana doesn't work on perl 5.14+. Since it depended on regexp stringification. This code is ugly. substr( $str, 0, 8, '' ); # remove '(?-xism:' substr( $str, -1, 1, '' ); # and ')';Perl 5.9.5+ provides re::regexp_pattern method for this purpose. I think this code is better to fix issue. if ($]