--TEST--
extractRawDateFromFolder: extracts YYYY-MM-DD from date-prefixed folder names
--FILE--
<?php
require '/var/www/app/helpers.php';

echo extractRawDateFromFolder('2024-01-15-my-post') . "\n";
echo extractRawDateFromFolder('2024-12-31-year-end') . "\n";
echo (extractRawDateFromFolder('no-date-here') ?? 'null') . "\n";
echo (extractRawDateFromFolder('') ?? 'null') . "\n";
echo (extractRawDateFromFolder('2024-1-1-bad-format') ?? 'null') . "\n";
echo (extractRawDateFromFolder('20240115-no-separators') ?? 'null') . "\n";
?>
--EXPECT--
2024-01-15
2024-12-31
null
null
null
null