^start of line
\\the literal \ (9210 / 1348 / 5C16)
mthe literal m (10910 / 1558 / 6D16) (case sensitive)
\s+any whitespace character, repeated at least once
Non-Capturing Group(?:\w+\s+)* *repeats the group contents below any number of times:
\w+any word character, repeated at least once
\s+any whitespace character, repeated at least once
\w+any word character, repeated at least once
:the literal : (5810 / 728 / 3A16)
\s*any whitespace character, repeated any number of times
.*any character (except for line terminators), repeated any number of 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