PHP Matching Guids/Uuids – String Function

<?php
$uuid = "1111-1111-1111-1111"; function printResults($str) {
if (eregi("^[0-9a-f]{8}(-[0-9a-f]{4}){3}-[0-9a-f]{12}$", $str)) {
    printf("'%s' is a valid GUID/UUID.\n", $str);
} else {
    printf("'%s' is NOT a valid GUID/UUID.\n", $str);
}
} printResults($uuid); ?>

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