^start of line
Group Movie(?P<Movie>.*?) .*?any Unicode character (except for line terminators), repeated any number of times
\s+a Unicode whitespace character, repeated at least once
Group Category(?P<Category>\S+) \S+any character that is not Unicode whitespace, repeated at least once
\s+a Unicode whitespace character, repeated at least once
xthe literal x (12010 / 1708 / 7816) (case sensitive)
\s+a Unicode whitespace character, repeated at least once
Group Rating(?P<Rating>\d+) \d+a Unicode decimal digit, repeated at least once
$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