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run code in 150+ php & hhvm versions
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<?php $regex = '#<tag foo="bar">([\w\s]+)([^\s]+)</tag>#'; echo preg_replace($regex, '\1', '<tag foo="bar">Jacopo Nuzzi</tag>'). " $\n"; echo preg_replace($regex, '\1', '<tag foo="bar">Jacopo Nuzzi </tag>'). " $\n"; echo preg_replace($regex, '\1', '<tag foo="bar">Jacopo </tag>'). " $\n"; echo preg_replace($regex, '\1', '<tag foo="bar">Jacopo</tag>'). " $\n";
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Jacopo Nuzz $ <tag foo="bar">Jacopo Nuzzi </tag> $ <tag foo="bar">Jacopo </tag> $ Jacop $