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preg_replace('/\[[^\[\]]\]/m', '', $str);
$str="aaaaa[b]sdfsd(1)fsdf[c]eeeee";
echo preg_replace("/\[[^\[\]]\]/", "", $str);
$str = preg_replace("/\[.*?\]/","",$str);
echo $str;
$str="aaaaa[b]sdfsd(1)fsdf[c]eeeee";
echo preg_replace("/\[[^[]]+\]/", "", $str);
$str = preg_replace("\[.*?\]","",$str);
echo $str;