Regular Expressions 101

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/
^(..[^^].\$|[^?\n]\w)$|~
/
gm
1st Alternative
^(..[^^].\$|[^?\n]\w)$
^ asserts position at start of a line
1st Capturing Group
(..[^^].\$|[^?\n]\w)
1st Alternative
..[^^].\$
. matches any character (except for line terminators)
. matches any character (except for line terminators)
Match a single character not present in the list below
[^^]
^ matches the character ^ literally (case sensitive)
.
matches any character (except for line terminators)
{4,22} matches the previous token between 4 and 22 times, as many times as possible, giving back as needed (greedy)
\$ matches the character $ literally (case sensitive)
2nd Alternative
[^?\n]\w
Match a single character not present in the list below
[^?\n]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
? matches the character ? literally (case sensitive)
\n matches a line-feed (newline) character (ASCII 10)
\w matches any word character (equivalent to [a-zA-Z0-9_])
$ asserts position at the end of a line
2nd Alternative
~
~ matches the character ~ 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.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String