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import re
from re import search
PATTERN = re.compile("hello( world)?")
# these should match
_ = re.search(PATTERN, "hello world")
_ = re.match(PATTERN, "hello world")
_ = re.fullmatch(PATTERN, "hello world")
_ = re.split(PATTERN, "hello world")
_ = re.split(PATTERN, "hello world", 1)
_ = re.split(PATTERN, "hello world", maxsplit=1)
_ = re.findall(PATTERN, "hello world")
_ = re.finditer(PATTERN, "hello world")
_ = re.sub(PATTERN, "hello world", "goodbye world")
_ = re.sub(PATTERN, "hello world", "goodbye world", 1)
_ = re.sub(PATTERN, "hello world", "goodbye world", count=1)
_ = re.subn(PATTERN, "hello world", "goodbye world")
_ = re.subn(PATTERN, "hello world", "goodbye world", count=1)
_ = search(PATTERN, "hello world")
# these should not
_ = re.search(PATTERN, "hello world", re.IGNORECASE)
_ = re.match(PATTERN, "hello world", re.IGNORECASE)
_ = re.fullmatch(PATTERN, "hello world", re.IGNORECASE)
_ = re.split(PATTERN, "hello world", flags=re.IGNORECASE)
_ = re.split(PATTERN, "hello world", 1, flags=re.IGNORECASE)
_ = re.findall(PATTERN, "hello world", re.IGNORECASE)
_ = re.finditer(PATTERN, "hello world", re.IGNORECASE)
_ = re.sub(PATTERN, "hello world", "goodbye world", flags=re.IGNORECASE)
_ = re.sub(PATTERN, "hello world", "goodbye world", 1, re.IGNORECASE)
_ = re.subn(PATTERN, "hello world", "goodbye world", flags=re.IGNORECASE)
_ = re.subn(PATTERN, "hello world", "goodbye world", 1, flags=re.IGNORECASE)
_ = PATTERN.search("hello world")
_ = re.search("hello world", "hello world")
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