\ban ASCII word boundary
Bluethe literal text Blue (case sensitive) \S*any non-whitespace character, repeated any number of times
\h+any horizontal whitespace character, repeated at least once
\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match
\w+any word character, repeated at least once
Non-Capturing Group(?:::\w+)* *repeats the group contents below any number of times:
\w+any word character, repeated at least once
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