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$newHtml = preg_replace("/(<script.*?someuniqtext.*?\/script>/ms", "", $oldHtml);

$str = "qwerty[0]['bit']";

if (preg_match("/^(.*?)\[(.*?)\]\['(.*?)'\]/", $str, $matches))
{
	$arr = [
		'q' => $matches[1],
		'key' => $matches[2],
		'name' => $matches[3]
	];
}