Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
data.txt is an access log of 1000+ lines. Extract the lines from IP 192.168.1.100 and find the flag (FLAG{...}) among them.
Check whether each line contains 192.168.1.100
Use a regex (re.search) to find FLAG{...}
Exactly one of the target-IP lines contains the flag