Group initials(?P<initials>\w+) \w+a Unicode word character, repeated at least once
\s*a Unicode whitespace character, repeated any number of times
-?optionally matches the literal - (4510 / 558 / 2D16)
\s*a Unicode whitespace character, repeated any number of times
Group month(?P<month>\d{1,2}|JAN\w*) \d{1,2}a Unicode decimal digit, repeated between 1 and 2 times
JANthe literal text JAN (case insensitive) \w*a Unicode word character, repeated any number of times
\s*a Unicode whitespace character, repeated any number of times
-?optionally matches the literal - (4510 / 558 / 2D16)
\s*a Unicode whitespace character, repeated any number of times
Group year(?P<year>\d{2,4}) \d{2,4}a Unicode decimal digit, repeated between 2 and 4 times
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string
i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters
g modifier: global. Finds all matches instead of stopping after the first