Basic Regex syntax.
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.
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Wildcard
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^
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Start of a string
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$
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End of a string
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x*
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0+ repetitions of x
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x+
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1+ repetitions of x
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x?
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0-1 repetitions of x
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x{m}
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m repetitions of x
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x{m,n}
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m-n repetitions of x, greedy
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x{m,n}?
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m-n repetitions of x, non-greedy
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x|y
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x OR y
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[^x]
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NOT x
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\a
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Literal 'a'
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x*{int}
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'x*' must be int long
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< x > < y >
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Collocations of x and y
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<x> (<y>)
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Only returns y
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\n
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newline
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\s
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space
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\t
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tab
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\e
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escape
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\r
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return
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search()
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Somewhere in string
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findall()
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Somewhere in the string, non-overlapping
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match()
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Beginning of string
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fullmatch()
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Entire string
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\A
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IS at start of string
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\b
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IS at wordbreak
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\B
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NOT at wordbreak
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\d
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IS [0-9]
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\D
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NOT [0-9]
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\s
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White space characters
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\S
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NOT white space characters
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\w
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IS Unicode word character [a-ZA-Z0-9_]
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\W
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NOT Unicode word character
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\Z
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IS at end of string
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'{:n}'.format(x)
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Prints x, padded with n whitespace
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{:<n}
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Left justified
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{:>n}
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Right justified
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{:.nf}
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Show n decimal places
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'{:{width}}'.format('x', width=n)
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1
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Parenthesis
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( )
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2
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Counters
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* + ? { }
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3
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Sequences and anchors
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^ $
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4
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Disjunction
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re.I
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re.IGNORECASE
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re.M
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re.MULTILINE
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^ $ match line boundaries
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re.X
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re.VERBOSE
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Ignores whitespace
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