Regular Expressions 101

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/
([.$?]|G\])\$$|^\^P|\]P$
/
gm
1st Alternative
([.$?]|G\])\$$
1st Capturing Group
([.$?]|G\])
1st Alternative
[.$?]
Match a single character present in the list below
[.$?]
.$? matches a single character in the list .$? (case sensitive)
2nd Alternative
G\]
G matches the character G literally (case sensitive)
\] matches the character ] literally (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
\^
matches the character ^ literally (case sensitive)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
P matches the character P literally (case sensitive)
3rd Alternative
\]P$
\] matches the character ] literally (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.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String