Parser für <link> in bodytext-Feldern
$splitContent = preg_split('|(<link[^>]*>[^<]+</link>)|', $content, -1, PREG_SPLIT_DELIM_CAPTURE);
$content = '';
foreach ($splitContent as $part) {
	if (substr($part, 0, 5) === '<link') {
		preg_match('|<link\s+(?P<linkend>[^\s>]+)(?:\s(?P<target>[^\s>]+))?(?:\s(?P<class>[^\s>]+))?(?:\s"(?P<title>[^">]+)")?>(?P<linktext>[^<]*)</link>|xui', $part, $matches);
		if ($matches !== array()) {
			$content .= '<a href="' . $matches['linkend'] . '"';
			if ($matches['target'] !== '' && $matches['target'] !== '-'&& $matches['target'] !== 'page') {
				// popup creation is not supported
				if (strpos($matches['target'], 'x') === FALSE) {
					$content .= ' target="' . $matches['target'] . '"';
				}
			}
			if ($matches['class'] !== '') {
				$content .= ' class="' . $matches['class'] . '"';
			}
			if ($matches['title'] !== '') {
				$content .= ' title="' . $matches['title'] . '"';
			}
			$content .= '>' . $matches['linktext'] . '</a>';
		} else {
			$content .= $part;
		}
	} else {
		$content .= $part;
	}
}