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@ 2020-01-29T15:04:30Z

<?php

$origString = 'My-Cool-String - 201';
$newString = preg_replace("/-(?=.* -)/", ' ', $origString);
echo $newString;

Output
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preg_replace: documentation ( source)

preferences:dark modelive preview

53.16 ms | 402 KiB | 5 Q