Regular Expressions 101

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"
[[?C(].[-!)|w]|^P|^[^C|\\]*$
"
gm
1st Alternative
[[?C(].[-!)|w]
Match a single character present in the list below
[[?C(]
[?C(
matches a single character in the list [?C( (case sensitive)
. matches any character (except for line terminators)
Match a single character present in the list below
[-!)|w]
-!)|w
matches a single character in the list -!)|w (case sensitive)
2nd Alternative
^P
^ asserts position at start of a line
P matches the character P with index 8010 (5016 or 1208) literally (case sensitive)
3rd Alternative
^[^C|\\]*$
^ asserts position at start of a line
Match a single character not present in the list below
[^C|\\]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
C|
matches a single character in the list C| (case sensitive)
\\ matches the character \ with index 9210 (5C16 or 1348) 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