• ^ matches the beginning of a string.
• $ matches the end of a string.
• \b matches a word boundary.
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• \d matches any numeric digit.
• \D matches any non-numeric character.
• x? matches an optional x character (in other words, it matches an x zero or one times).
• x* matches x zero or more times.
• x+ matches x one or more times.
• x{n,m} matches an x character at least n times, but not more than m times.
• (a|b|c) matches exactly one of a, b or c.
• (x) in general is a remembered group. You can get the value of what matched by using the groups() method
of the object returned by re.search.
python re
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