Online PHP editor | output for d197u

<?php $version = '5.5.58-0ubuntu0.14.04.1'; echo '<pre>'; var_dump(preg_match('/^(?P<major>\d+)(?:\.(?P<minor>\d+)(?:\.(?P<patch>\d+))?)?/', $version, $versionParts)); if (!preg_match('/^(?P<major>\d+)(?:\.(?P<minor>\d+)(?:\.(?P<patch>\d+))?)?/', $version, $versionParts)) { echo "RegEx failed on " . $version . PHP_EOL; } else { echo "RegEx extracted version parts" . PHP_EOL; var_dump($versionParts); } function errorValue($error) { return defined($error) ? constant($error) : $error; } $errors = array( 'PREG_NO_ERROR', 'PREG_INTERNAL_ERROR', 'PREG_BACKTRACK_LIMIT_ERROR', 'PREG_RECURSION_LIMIT_ERROR', 'PREG_BAD_UTF8_ERROR', 'PREG_BAD_UTF8_OFFSET_ERROR', 'PREG_JIT_STACKLIMIT_ERROR' ); $pregErrors = array_combine( array_map('errorValue', $errors), $errors ); echo $pregErrors[preg_last_error()] . PHP_EOL; echo '</pre>';