Regular Expressions 101

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/
!|[^?]P(CG|G..)?$
/
gm
1st Alternative
!
! matches the character ! with index 3310 (2116 or 418) literally (case sensitive)
2nd Alternative
[^?]P(CG|G..)?$
Match a single character not present in the list below
[^?]
? matches the character ? with index 6310 (3F16 or 778) literally (case sensitive)
P matches the character P with index 8010 (5016 or 1208) literally (case sensitive)
1st Capturing Group
(CG|G..)?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
1st Alternative
CG
CG
matches the characters CG literally (case sensitive)
2nd Alternative
G..
G matches the character G with index 7110 (4716 or 1078) literally (case sensitive)
. matches any character (except for line terminators)
. matches any character (except for line terminators)
$ 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

/
/
gm

Test String