Regular Expressions 101

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/
[^?][PG]$|<|PG
/
gm
1st Alternative
[^?][PG]$
Match a single character not present in the list below
[^?]
? matches the character ? with index 6310 (3F16 or 778) literally (case sensitive)
Match a single character present in the list below
[PG]
PG
matches a single character in the list PG (case sensitive)
$ asserts position at the end of a line
2nd Alternative
<
< matches the character < with index 6010 (3C16 or 748) literally (case sensitive)
3rd Alternative
PG
PG
matches the characters PG literally (case sensitive)
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