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run code in 150+ php & hhvm versions
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<?php $_POST['keywords']="sample products!@, products#$#, sample"; $keywords = preg_replace("/ui/[^A-Z, ]/i", '',($_POST['keywords'])); echo $keywords;
Output for 4.3.11 - 7.1.0
Warning: preg_replace(): Unknown modifier '[' in /in/eE7aV on line 3
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '[' in /in/eE7aV on line 3