Extract IP address from record using MapReduce Streaming

The goal is to extract IP address from input files. The script reads each line and uses regular expression to extract IP address.

#!/usr/bin/python

import re
import sys

# Use "(?:" to suppress capturing parenethesis.
# Use "\." to match a dot (suppress regex meaning of ".")
# "{3}": Look for 3 iterations (3 iterations of a dot followed by a number).
my_regex = r'[0-9]+(?:\.[0-9]+){3}'

for line in sys.stdin:
 IPs = re.findall(my_regex, line)
 if len(IPs) == 1:
 print IPs[0]

Run the code:

hadoop@fxu-t60:/usr/local/hadoop$ bin/hadoop jar contrib/streaming/hadoop-0.20.2-streaming.jar -D mapred.reduce.tasks=1 -input /home/hadoop/google -output /home/hadoop/google-ip -mapper 'googleIP.py' -file ~/Desktop/data/TLD/googleIP.py
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