^start of line
\s+any whitespace character, repeated at least once
\S+any non-whitespace character, repeated at least once
\s+any whitespace character, repeated at least once
Group 1([\dA-Z][A-Z\d\s]+?) \da digit
A-Zone character from A (6510) to Z (9010) (case sensitive)
Character Class[A-Z\d\s]+? +?matches at least one character from the set below:
A-Zone character from A (6510) to Z (9010) (case sensitive)
\da digit
\sany whitespace character
\s{2,}any whitespace character, repeated at least 2 times
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