Regular Expressions 101

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"
\?[^w$]\$$|^P|\w.\)|w.\+|w\^|[^?P]P$
"
gm
1st Alternative
\?[^w$]\$$
\? matches the character ? literally (case sensitive)
Match a single character not present in the list below
[^w$]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
w$ matches a single character in the list w$ (case sensitive)
\$ matches the character $ literally (case sensitive)
$ asserts position at the end of a line
2nd Alternative
^P
^ asserts position at start of a line
P matches the character P literally (case sensitive)
3rd Alternative
\w.\)
\w matches any word character (equivalent to [a-zA-Z0-9_])
. matches any character (except for line terminators)
\) matches the character ) literally (case sensitive)
4th Alternative
w.\+
w matches the character w literally (case sensitive)
.
matches any character (except for line terminators)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
\+ matches the character + literally (case sensitive)
5th Alternative
w\^
w matches the character w literally (case sensitive)
\^ matches the character ^ literally (case sensitive)
6th Alternative
[^?P]P$
Match a single character not present in the list below
[^?P]
?P matches a single character in the list ?P (case sensitive)
P matches the character P literally (case sensitive)
$ asserts position at the end of a line
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"
gm

Test String