# re

# 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)

# re.search(pattern, string)

Return a match object if the string matches the pattern, and None otherwise.

# re.split(pattern, string)

Split the string by the occurrences of the pattern.

# re.sub(pattern, repl, string)

Return a copy of the string with all occurrences of the pattern replaced by the replacement string.