markdown link to restructured (rst) synthax

php.php

<?php

$oldFileContent = file($argv[1]);
$newFileContent = array();
foreach ($oldFileContent as $line)
{
	$pattern = '#(.*)\[([[:print:]]*)\]\((https?://.*)\)(.*)#';
	$newFileContent[] = preg_replace($pattern, '$1`$2 <$3>`_$4', $line);
}

file_put_contents($argv[1], implode('', $newFileContent));

shell-to-execute

find -name *.rst -exec php php.php {} \;