^start of line
\wa Unicode word character
\da Unicode decimal digit
\w?optionally matches a Unicode word character
\.the literal . (4610 / 568 / 2E16)
\w*a Unicode word character, repeated any number of times
$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