84949cc5-4701-4a84-895b-354c584a981b is valid, OK
84949CC5-4701-4A84-895B-354C584A981B is valid, OK
84949cc5-4701-4a84-895b-354c584a981bc is invalid, OK
84949cc5-4701-4a84-895b-354c584a981 is invalid, OK
84949cc5x4701-4a84-895b-354c584a981b is invalid, OK
84949cc504701-4a84-895b-354c584a981b is invalid, OK
84949cc5-470104a84-895b-354c584a981b is invalid, OK
84949cc5-4701-4a840895b-354c584a981b is invalid, OK
84949cc5-4701-4a84-895b0354c584a981b is invalid, OK
g4949cc5-4701-4a84-895b-354c584a981b is invalid, OK
84949cc5-4701-4a84-895b-354c584a981g is invalid, OK
00000000-0000-0000-0000-000000000000 is valid, OK
01234567-89ab-cdef-0134-567890abcedf is valid, OK
ffffffff-ffff-ffff-ffff-ffffffffffff is valid, OK
return value: 0