import re

def fancy_split(s):
    return re.findall(r'[^",]+|"(?:[^\"]|\")*"', s)

test_cases = [
    ("a,b,c", ["a", "b", "c"]),
    ('a,"b,c"', ["a", '"b,c"']),
    ('a,"b\\",\\"c"', ["a", '"b\\",\\"c"']),
    ("a,,b", ["a", "", "b"])
]

for input, expected_output in test_cases:
    actual_output = fancy_split(input)
    print(input)
    print(f"  {expected_output!r}")
    print(f"  {actual_output!r}")