extended laravel escaping with exclusion some tags

helpers.php

<?php
/**
 * use in blade template `{!! ex($message, ['br', 'strong']) !!}` 
 */
if (!function_exists('ex')) {
    function ex($str, array $excluded)
    {
        $patterns = $tags = [];
        foreach ($excluded as $ex) {
            $open_tag = '<' . $ex . '>';
            $close_tag = '</' . $ex . '>';
            $patterns[] = '~' . preg_quote(e($open_tag), '~') . '~';
            $tags[] = $open_tag;
            $patterns[] = '~' . preg_quote(e($close_tag), '~') . '~';
            $tags[] = $close_tag;
        }

        return preg_replace($patterns, $tags, e($str));
    }
}