import re
import itertools
from spellchecker import SpellChecker
SPELL= SpellChecker()
def canidates(letters, min=2, max=5):
    pos = []
    for length in range(min, max+1):
        for comb in itertools.combinations(letters, length):
            for perm in itertools.permutations(comb):
                word = ''.join(perm)
                pos.append(word)
    return SPELL.known(pos)

def filter_pos(pos, regex):
    pat = re.compile(regex)
    return list(filter(pat.match,pos))