If the provided address is not a contract, empty bytecode is returned.
The address of the account/ contract
"0x0000000000000000000000000000456E65726779"
^(0x)?[0-9a-fA-F]{40}$
OK
Contract bytecode, presented as a hexadecimal string.
"0x6060604052600080fd00a165627a7a72305820c23d3ae2dc86ad130561a2829d87c7cb8435365492bd1548eb7e7fc0f3632be90029"
^0x[0-9a-f]*$