def test_number():
int_pattern = r.seq(r.opt(r.alt(r.quote("+"), r.quote("-"))),
r.repeat(1, None, r.char_from("0123456789")))
num_pattern = r.seq(int_pattern,
r.opt(r.seq(r.quote("."),
r.opt(int_pattern))))
number = re.compile(num_pattern)
assert not number.fullmatch("foo")
assert not number.fullmatch("+")
assert number.fullmatch("0")
assert number.fullmatch("-42")
assert number.fullmatch("3.")
assert number.fullmatch("3.14")
def test_unlimited_repetition():
pattern = r.repeat(2, None, r.alt(r.quote("cat"), r.quote("dog")))
assert not re.fullmatch(pattern, 'cat')
assert re.fullmatch(pattern, 'catdog')
assert re.fullmatch(pattern, 'dogcatcat')
assert re.fullmatch(pattern, 'dogcatcatdogdogcat')
def test_repetition_max_less_than_min_is_ignored():
assert r.repeat(2, 1, "foo") == "(foofoo)"
def test_repetition_min_max():
assert r.repeat(2, 4, "foo") == "(foofoo(foo|)(foo|))"
def test_repetition_no_max():
assert r.repeat(2, None, r.quote("foo")) == "((foo)(foo)(foo)*)"
def test_repetition_min_same_as_max():
assert r.repeat(3, 3, "foo") == "(foofoofoo)"