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re
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re.match(pattern, string)
Return a match object if the string matches the pattern, and None
otherwise. (force match at the beginning of the string)
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re.search(pattern, string)
Return a match object if the string matches the pattern, and None
otherwise.
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re.split(pattern, string)
Split the string by the occurrences of the pattern.
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re.sub(pattern, repl, string)
Return a copy of the string with all occurrences of the pattern replaced by the replacement string.