NLthe literal text NL (case sensitive) \s?optionally matches a Unicode whitespace character
\d{2}a Unicode decimal digit, repeated exactly 2 times
\s?optionally matches a Unicode whitespace character
{4}matches exactly 4 characters from the set below:
A-Zone character from A (6510) to Z (9010) (case sensitive)
0the literal 0 (4810 / 608 / 3016)
\s?optionally matches a Unicode whitespace character
\d{9}a Unicode decimal digit, repeated exactly 9 times
$end of line
the literal ↵ (1010 / 128 / A16)
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