(?m)applies the following effective flags to the remainder of the pattern: m m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string
^start of line
DOCUMENTATIONthe literal text DOCUMENTATION (case sensitive) .*any Unicode character (except for line terminators), repeated any number of times
\"{3}the literal " (3410 / 428 / 2216) , repeated exactly 3 times
'{3}the literal ' (3910 / 478 / 2716) , repeated exactly 3 times
\na line-feed (newline) character (ASCII 10)
-*the literal - (4510 / 558 / 2D16) , repeated any number of times
\n?optionally matches a line-feed (newline) character (ASCII 10)
+?matches at least one character from the set below:
\sa Unicode whitespace character
\Sany character that is not Unicode whitespace
^start of line
\1the text saved by group 1
*matches any number of characters from the set below:
\sa Unicode whitespace character
\Sany character that is not Unicode whitespace