import sys
import re
import itertools

def uniq(ls):
    return (k for k, g in itertools.groupby(ls))

def ls(pathList, dir):
    pat = re.compile('%s([^/]+/?)' % re.escape(dir))
    matches = itertools.ifilter(None, (pat.match(path) for path in pathList))
    return list(uniq(sorted([m.group(1) for m in matches])))

def main(args):
    pathList = 'aaa/bbb aaa/ccc aaa/ddd/eee bbb/ddd/eee'.split()
    print ls(pathList, 'aaa/')
    print ls(pathList, 'aaa/ddd/')

if __name__ == '__main__':
    main(sys.argv[1:])