^start of line
-the literal - (4510 / 558 / 2D16)
.*any character (except for line terminators), repeated any number of times
$end of line
\r?optionally matches a carriage return (ASCII 13)
\na line-feed (newline) character (ASCII 10)
.any character (except for line terminators)
g modifier: global. Finds all matches instead of stopping after the first
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string