Luminate CMS: How to open a link in a new window when it links to the non-current site?

conditional-links.html

<t:if test="!isNull(link)">
	<t:if test="matches(link, 'http://example.com/.*')">
		<a href="${link}">
	</t:if>
	<t:else>
		<a href="${link}" target="_blank">
	</t:else>
</t:if>
<img src="${url}" alt="${alt_text}" />
<t:if test="!isNull(link)">
	</a>
</t:if>