Regular Expressions 101

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/
^.[.-~]..\$$|[^P?][PG]$
/
gm
1st Alternative
^.[.-~]..\$$
^ asserts position at start of a line
.
matches any character (except for line terminators)
{3,23} matches the previous token between 3 and 23 times, as many times as possible, giving back as needed (greedy)
Match a single character present in the list below
[.-~]
.-~ matches a single character in the range between . (index 46) and ~ (index 126) (case sensitive)
. matches any character (except for line terminators)
. matches any character (except for line terminators)
\$ matches the character $ literally (case sensitive)
$ asserts position at the end of a line
2nd Alternative
[^P?][PG]$
Match a single character not present in the list below
[^P?]
P? matches a single character in the list P? (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
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.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String