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@ 2013-08-30T20:11:29Z

<?php
function koapToNum($koap){
	$o = array('@[^\d\.]@','\.\.');
	$n = array('','.');
	$digit = preg_replace($o, $n, $koap);
	return $digit;
}

echo koapToNum('12.21.1 ч.1.1');

Output
Performance
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preg_replace: documentation ( source)

preferences:dark modelive preview

37.39 ms | 402 KiB | 5 Q