Python re module: how to regex match extract a capture group from file

I have a file test.txt with this content:

CAR
one a. , z.
two b.
three c.
AIRPLANE
one a. , z.
two b.
three c.
BOAT
one a. , z.
two b.

I want to extract everything from CAR up to but not including AIRPLANE, and write that into output.txt. This regex gives me the everything I need in the capture group:

r"(CAR.*)AIRPLANE"s. link: regex101.com/r/QJMJFh/1

To test my input test.txt is entering the program, I do this:

s = open('test.txt')
s_content = s.read()
print(s_content)

It succeeds and produces this:

CAR
one a. , z.
two b.
three c.
AIRPLANE
one a. , z.
two b.
three c.
BOAT
one a. , z.
two b.

However, when I run this:

s_output = re.search(r"(CAR.*)AIRPLANE"s, s_content).group(1)
print(s_output)

It fails and says

  Cell In[85], line 4
    s_output = re.search(r"(CAR.*)AIRPLANE"s, s_content).group(1)
                         ^
SyntaxError: invalid syntax. Perhaps you forgot a comma?

How else can I regex match extract a capture group from this file using re module?

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