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def tests():
    assert subparts('^it$') == {'^', 'i', 't', '$', '^i', 'it', 't$', '^it', 'it$', '^it$'}
    assert subparts('this') == {'t', 'h', 'i', 's', 'th', 'hi', 'is', 'thi', 'his', 'this'}
    subparts('banana') == {'a', 'an', 'ana', 'anan', 'b', 'ba', 'ban', 'bana', 
                           'n', 'na', 'nan', 'nana'}
    
    assert dotify('it') == {'it', 'i.', '.t', '..'}
    assert dotify('^it$') == {'^it$', '^i.$', '^.t$', '^..$'}
    assert dotify('this') == {'this', 'thi.', 'th.s', 'th..', 't.is', 't.i.', 't..s', 't...',
                              '.his', '.hi.', '.h.s', '.h..', '..is', '..i.', '...s', '....'}
    assert regex_parts({'win'}, {'losers', 'bin', 'won'}) == {
        '^win$', '^win', '^wi.', 'wi.',  'wi', '^wi', 'win$', 'win', 'wi.$'}
    assert regex_parts({'win'}, {'bin', 'won', 'wine', 'wit'}) == {'^win$', 'win$'}
    regex_parts({'boy', 'coy'}, 
                {'ahoy', 'toy', 'book', 'cook', 'boycott', 'cowboy', 'cod', 'buy', 'oy', 
                 'foil', 'coyote'}) == {'^boy$', '^coy$', 'c.y$', 'coy$'}
    
    assert matches('a|b|c', {'a', 'b', 'c', 'd', 'e'}) == {'a', 'b', 'c'}
    assert matches('a|b|c', {'any', 'bee', 'succeed', 'dee', 'eee!'}) == {
        'any', 'bee', 'succeed'}
    
    assert OR(['a', 'b', 'c']) == 'a|b|c'
    assert OR(['a']) == 'a'
    
    assert words('this is a test this is') == {'this', 'is', 'a', 'test'}
    
    assert findregex({"ahahah", "ciao"},  {"ahaha", "bye"}) == 'a.$'
    assert findregex({"this", "that", "the other"}, {"one", "two", "here", "there"}) == 'h..$'
    assert findregex({'boy', 'coy', 'toy', 'joy'}, {'ahoy', 'buy', 'oy', 'foil'}) == '^.oy'
    
    assert not mistakes('a|b|c', {'ahoy', 'boy', 'coy'}, {'joy', 'toy'})
    assert not mistakes('^a|^b|^c', {'ahoy', 'boy', 'coy'}, {'joy', 'toy', 'kickback'})
    assert mistakes('^.oy', {'ahoy', 'boy', 'coy'}, {'joy', 'ploy'}) == {
        "Should have matched: ahoy", 
        "Should not have matched: joy"}
    return 'tests pass'

tests()