Regular Expressions 101

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/
(?<line>[^\)]+\)\n\N+)
/
mg
Named Capture Group line
(?<line>[^\)]+\)\n\N+)
Match a single character not present in the list below
[^\)]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
\) matches the character ) with index 4110 (2916 or 518) literally (case sensitive)
\n matches a line-feed (newline) character (ASCII 10)
\N
matches any non-newline character
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
Global pattern flags
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
mg

Test String