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@ 2017-09-04T09:04:32Z

<?php

$key = 'devices.deviceId.*';
if ( preg_match('/^([\w._]{1,})?\.*{1}?$/i', $key) ) {
	echo 'ist OK.';
} else {
	echo 'Format ist nicht OK.';
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

27.69 ms | 404 KiB | 5 Q