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<?php $_POST['keywords']="sample products!\@, products#$#\, sample"; $keywords = preg_replace("/\g/", ',',($_POST['keywords'])); echo $keywords;
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace(): Compilation failed: \g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number at offset 2 in /in/oI4FQ on line 3

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