\ban ASCII word boundary
exthe literal text ex (case sensitive) \h+any horizontal whitespace character, repeated at least once
\d+a digit, repeated at least once
\h*any horizontal whitespace character, repeated any number of times
\Ra newline sequence
.*any character (except for line terminators), repeated any number of times
\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match
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