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import re
from argparse import ArgumentParser

Basic Line Matching



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ap = ArgumentParser()
ap.add_argument("pattern")

args = ap.parse_args(["^[a-z]+"])
print args



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pattern = re.compile(args.pattern)



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lines = """
foo
123
abc
*!%&
"""
for line in lines.split():
    match = pattern.search(line)
    if match:
        print line

Matching Lines from Files



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ap.add_argument("files", nargs="+")

args = ap.parse_args(["^[a-z]+", "/etc/hosts", "/etc/pass*"])
print args



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import glob
pattern = re.compile(args.pattern)
for file in args.files:
    file_list = glob.glob(file)
    for file_name in file_list:
        with open(file_name) as f:
            for line in f.readlines():
                match = pattern.search(line)
                if match:
                    print "{}: {}".format(file_name, line.strip())

Better File Processing With fileinput



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import fileinput
from itertools import chain
file_list = list(chain(*(glob.glob(f) for f in args.files)))
for line in fileinput.input(file_list):
    match = pattern.search(line)
    if match:
        print "{}[{}]: {}".format(fileinput.filename(), fileinput.filelineno(), line.strip())