3v4l.org

run code in 300+ PHP versions simultaneously
<?php //heredoc $data = <<<__DATA__ ddd_DDD foo_FOO foo_FOD foo_bar FOO_foo ccc_cCc ddd_ddd __DATA__; $pattern = '~^([a-z]{3})_(?=[A-Z]{3})(?i:\1)$~'; echo "<pre>"; //foreach(preg_split('~[\r\n]+~', $data) as $key => $line){ foreach(explode("\n", $data) as $key => $line){ echo $key . " => " . $line . " => " . (preg_match( $pattern, $line, $matches) === 1 ? "true" : "false") . "<br>"; } echo "</pre>";
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.6 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
<pre>0 => ddd_DDD => true<br>1 => foo_FOO => true<br>2 => foo_FOD => false<br>3 => foo_bar => false<br>4 => FOO_foo => false<br>5 => ccc_cCc => false<br>6 => ddd_ddd => false<br></pre>
preferences:
247.67 ms | 406 KiB | 374 Q