import re

m = re.search(r"a+", "caaab")
assert m.group(0) == "aaa"
assert m.group() == "aaa"

m = re.match(r"(?ms)foo.*\Z", "foo\nbar")
assert m.group(0) == "foo\nbar"

assert re.match(r"a+", "caaab") is None
m = re.match(r"a+", "aaaab")
assert m.group(0) == "aaaa"

assert re.sub("a", "z", "caaab") == "czzzb"
assert re.sub("a+", "z", "caaab") == "czb"
assert re.sub("a", "z", "caaab", 1) == "czaab"
assert re.sub("a", "z", "caaab", 2) == "czzab"
assert re.sub("a", "z", "caaab", 10) == "czzzb"

assert re.sub("a", lambda m: m.group(0) * 2, "caaab") == "caaaaaab"

m = re.match(r"(\d+)\.(\d+)", "24.1632")
assert m.groups() == ('24', '1632')
assert m.group(2, 1) == ('1632', '24')

assert re.escape(r"1243*&[]_dsfAd") == r"1243\*\&\[\]_dsfAd"

assert re.split('x*', 'foo') == ['foo']
assert re.split("(?m)^$", "foo\n\nbar\n") == ["foo\n\nbar\n"]
assert re.split('\W+', 'Words, words, words.') == ['Words', 'words', 'words', '']
assert re.split('(\W+)', 'Words, words, words.') == ['Words', ', ', 'words', ', ', 'words', '.', '']
assert re.split('\W+', 'Words, words, words.', 1) == ['Words', 'words, words.']
assert re.split('[a-f]+', '0a3B9', flags=re.IGNORECASE) == ['0', '3', '9']
assert re.split('(\W+)', '...words, words...') == ['', '...', 'words', ', ', 'words', '...', '']

assert re.sub(r"[ :/?&]", "_", "http://foo.ua/bar/?a=1&b=baz/") == "http___foo.ua_bar__a=1_b=baz_"

text = "He was carefully disguised but captured quickly by police."
assert re.findall(r"\w+ly", text) == ['carefully', 'quickly']

text = "He was carefully disguised but captured quickly by police."
assert re.findall(r"(\w+)(ly)", text) == [('careful', 'ly'), ('quick', 'ly')]

text = "He was carefully disguised but captured quickly by police."
assert re.findall(r"(\w+)ly", text) == ['careful', 'quick']

_leading_whitespace_re = re.compile('(^[ \t]*)(?:[^ \t\n])', re.MULTILINE)
text = "\tfoo\n\tbar"
indents = _leading_whitespace_re.findall(text)
assert indents == ['\t', '\t']

text = "  \thello there\n  \t  how are you?"
indents = _leading_whitespace_re.findall(text)
assert indents == ['  \t', '  \t  ']