Regex pattern in sed to match hexadecimal address of fixed length

I would like to match a hexadecimal address of fixed length using a regex pattern in sed. For example: 0x000000010b2e993c 0x is always present followed by the sixteen-character hexadecimal number. This is successful: 's/0x[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]//' Is there a shorthand way to match whereby I can use 0x then [0-9a-f] occurring sixteen times?