<p>see this regexp to match all cases : <a href="http://regexr.com/39o1g">http://regexr.com/39o1g</a></p>

<pre><code>^(?:(architect|artist|brand|name|operator|subject):)?wikipedia(?:(?::)(\S*))?$
</code></pre>

<p>and</p>

<pre><code>^(?:(architect|artist|brand|name|operator|subject):)?wikidata$
</code></pre>

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