python
import sys
import re
import itertools
def filter_func(input):
return re.match('pattern', input)
def main():
input_list = ['input1', 'input2', 'input3']
filtered_list = filter(filter_func, input_list)
percol_list = list(filtered_list)
for index, item in enumerate(percol_list):
sys.stdout.write('%d: %s
' % (index, item))
if __name__ == '__main__':
main()
