How to use special characters in Python Regular Expression?

From Python documentation

Non-special characters match themselves. Special characters don't match themselves −

\	Escape special char or start a sequence.
.	Match any char except newline, see re.DOTALL
^	Match start of the string, see re.MULTILINE
$	Match end of the string, see re.MULTILINE
[ ]	Enclose a set of matchable chars
R\|S	Match either regex R or regex S.
()	Create capture group, & indicate precedence

After '[', enclose a set, the only special chars are −

]	End the set, if not the 1st char
-	A range, eg. a-c matches a, b or c
^	Negate the set only if it is the 1st char

Quantifiers (append '?' for non-greedy) −

{m}	Exactly m repetitions
{m,n}	From m (default 0) to n (default infinity)
*	0 or more. Same as {,}
+	1 or more. Same as {1,}
?	0 or 1. Same as {,1}

Published on 11-Jan-2018 12:40:36