Python Regular Expressions - Dataquest
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Data Science Cheat Sheet
Python Regular Expressions
S P E C I A L C H A R AC T E R S
^ | Matches the expression to its right at the
start of a string. It matches every such
instance before each \n in the string.
$ | Matches the expression to its left at the
end of a string. It matches every such
\A | Matches the expression to its right at the
absolute start of a string whether in single
or multi-line mode.
\Z | Matches the expression to its left at the
absolute end of a string whether in single
or multi-line mode.
instance before each \n in the string.
terminators like \n.
character classes.
A|B | Matches expression A or B. If A is
matched first, B is left untried.
+ | Greedily matches the expression to its left 1
or more times.
* | Greedily matches the expression to its left
0 or more times.
? | Greedily matches the expression to its left
0 or 1 times. But if ? is added to qualifiers
(+, *, and ? itself) it will perform matches in
a non-greedy manner.
{m} | Matches the expression to its left m
times, and not less.
{m,n} | Matches the expression to its left m to
n times, and not less.
by A, but unlike (?PAB), it cannot be
retrieved afterwards.
(?#...) | A comment. Contents are for us to
read, not for matching.
A(?=B) | Lookahead assertion. This matches
the expression A only if it is followed by B.
. | Matches any character except line
\ | Escapes special characters or denotes
(?:A) | Matches the expression as represented
A(?!B) | Negative lookahead assertion. This
S E TS
matches the expression A only if it is not
[ ] | Contains a set of characters to match.
followed by B.
[amk] | Matches either a, m, or k. It does not
match amk.
(? ................
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