3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = ["22.22", "00.44", "44", "55.00", "0.50", "00.5", "0.5"]; foreach($arr as $val){ echo $val . " "; var_export(preg_match("/^\d{2}\.\d{2}$|^\d{2}$/", $val)); echo "\n"; }

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157.94 ms | 405 KiB | 5 Q