http://stackoverflow.com/questions/4585255/how-to-filter-all-words-which-contain-n-or-more-characters/4585315

morethan.py

#!/usr/bin/env python

# http://stackoverflow.com/questions/4585255/how-to-filter-all-words-which-contain-n-or-more-characters/4585315

import sys, re

def morethan(n, file_or_string):
    try:
        content = open(file_or_string, 'r').read()
    except:
        content = file_or_string
    pattern = re.compile("[\w]{%s,}" % n)
    return pattern.findall(content)

if __name__ == '__main__':
    try:
        print morethan(*sys.argv[1:])
    except:
        print >> sys.stderr, 'Usage: %s [COUNT] [FILENAME]' % sys.argv[0]