How do you test code that uses regex recursion and (?(DEFINE))?

This example showcases how to test code that uses regex recursion and the (?(DEFINE)) construct in Perl.

regex, recursion, Perl, testing, (?(DEFINE))

<?php // An example of a Perl regex with recursion $pattern = '/(?\<\w+\>)(?(DEFINE)(?&open))(?\<\/\w+\>)/'; $subject = '
Hello
'; if (preg_match($pattern, $subject)) { echo "Match found!"; } else { echo "No match."; } ?>

regex recursion Perl testing (?(DEFINE))

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