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    <h3>Editing: FilecontentFilterIterator.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Finder\Iterator;

/**
 * FilecontentFilterIterator filters files by their contents using patterns (regexps or strings).
 *
 * @author Fabien Potencier  &lt;fabien@symfony.com&gt;
 * @author Włodzimierz Gajda &lt;gajdaw@gajdaw.pl&gt;
 *
 * @extends MultiplePcreFilterIterator&lt;string, \SplFileInfo&gt;
 */
class FilecontentFilterIterator extends MultiplePcreFilterIterator
{
    /**
     * Filters the iterator values.
     *
     * @return bool
     */
    #[\ReturnTypeWillChange]
    public function accept()
    {
        if (!$this-&gt;matchRegexps &amp;&amp; !$this-&gt;noMatchRegexps) {
            return true;
        }

        $fileinfo = $this-&gt;current();

        if ($fileinfo-&gt;isDir() || !$fileinfo-&gt;isReadable()) {
            return false;
        }

        $content = $fileinfo-&gt;getContents();
        if (!$content) {
            return false;
        }

        return $this-&gt;isAccepted($content);
    }

    /**
     * Converts string to regexp if necessary.
     *
     * @param string $str Pattern: string or regexp
     *
     * @return string
     */
    protected function toRegex(string $str)
    {
        return $this-&gt;isRegex($str) ? $str : '/'.preg_quote($str, '/').'/';
    }
}
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