^start of line
\(the literal ( (4010 / 508 / 2816)
{3}matches exactly 3 characters from the set below:
\da digit
\)the literal ) (4110 / 518 / 2916)
\sany whitespace character
{3}matches exactly 3 characters from the set below:
\da digit
-the literal - (4510 / 558 / 2D16)
{4}matches exactly 4 characters from the set below:
\da digit
$end of line
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