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run code in 150+ php & hhvm versions
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<?php $str = "<b>ayàt</b><br /><b>ollàh</b>"; echo $str; echo "\n"; $str = preg_replace( "/</u", " <", $str ); echo $str; ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
<b>ayàt</b><br /><b>ollàh</b> <b>ayàt </b> <br /> <b>ollàh </b>