\$the literal $ (3610 / 448 / 2416)
\d+a digit, repeated at least once
*matches any number of characters from the set below:
\da digit
.the literal . (4610 / 568 / 2E16)
\ban ASCII word boundary
\s*any whitespace character, repeated any number of times
\Zend of string, or before its final line terminator