Emailaddress regex pattern tester

mail-regex-tester.php

<?php

if (isset($_POST['submit'])) {

  $html = file_get_contents('http://fightingforalostcause.net/misc/2006/compare-email-regex.php');
	
	$dom = new DOMDocument();
	@$dom->loadHTML($html);
	
	//$results = $dom->getElementById('results');
	$xpath = new DOMXPath($dom);
	
	$nodes = $xpath->query("//table[@id='results']/tr/td[1]");
	$addresses = [
		'valid' => [],
		'invalid' => [],
	];
	$type = 'valid';
	foreach ($nodes as $node) {
		if ($node->textContent == 'These should be invalid') {
			$type = 'invalid';
			continue;
		} elseif ($node->textContent == 'These should be valid' || !trim($node->textContent)) {
			continue;
		}
		
		$addresses[$type][] = $node->textContent;
	}
	
	echo '<h1>Valid emailaddresses</h1>';
	echo '<table>';
	foreach ($addresses['valid'] as $address) {
		$passFail = (preg_match($_POST['pattern'], $address) === 1) ? 'PASS' : 'FAIL';
		echo '    <tr>';
		echo '        <td>' . $address . '</td>';
		echo '        <td>' . $passFail . '</td>';
		echo '    </tr>';
	}
	echo '</table>';

	echo '<h1>Invalid emailaddresses</h1>';
	echo '<table>';
	foreach ($addresses['valid'] as $address) {
		$passFail = (preg_match($_POST['pattern'], $address) === 0) ? 'PASS' : 'FAIL';
		echo '    <tr>';
		echo '        <td>' . $address . '</td>';
		echo '        <td>' . $passFail . '</td>';
		echo '    </tr>';
	}
	echo '</table>';	
	}
?>

<form action="" method="post">
	<input type="text" name="pattern">
	<input type="submit" name="submit" value="validate">
</form>