^start of line
\ba Unicode word boundary
\w+a Unicode word character, repeated at least once
\ba Unicode word boundary
.*any Unicode character (except for line terminators), repeated any number of times
TSthe literal text TS (case sensitive) .*?any Unicode character (except for line terminators), repeated any number of times
Positive Lookahead(?=RMK) RMKthe literal text RMK (case sensitive) 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