<form method="POST">
    <h3>Editing: ApplicationName.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php declare(strict_types = 1);
/*
 * This file is part of PharIo\Manifest.
 *
 * Copyright (c) Arne Blankerts &lt;arne@blankerts.de&gt;, Sebastian Heuer &lt;sebastian@phpeople.de&gt;, Sebastian Bergmann &lt;sebastian@phpunit.de&gt; and contributors
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 */
namespace PharIo\Manifest;

use function preg_match;
use function sprintf;

class ApplicationName {
    /** @var string */
    private $name;

    public function __construct(string $name) {
        $this-&gt;ensureValidFormat($name);
        $this-&gt;name = $name;
    }

    public function asString(): string {
        return $this-&gt;name;
    }

    public function isEqual(ApplicationName $name): bool {
        return $this-&gt;name === $name-&gt;name;
    }

    private function ensureValidFormat(string $name): void {
        if (!preg_match('#\w/\w#', $name)) {
            throw new InvalidApplicationNameException(
                sprintf('Format of name &quot;%s&quot; is not valid - expected: vendor/packagename', $name),
                InvalidApplicationNameException::InvalidFormat
            );
        }
    }
}
</textarea><br>
    <input type="submit" value="Save">
</form>