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almut
<blockquote>
<i>...which (in pre-5.10) will output empty strings every time.</i>
</blockquote>
<p> With 5.10.0, <c>/(?=(.*?))/g;</c> outputs <i>one</i> empty string. And I can confirm the behavior reported by [jds17] with <c>/(?=(.*))/g</c>. </p>
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