\ba Unicode word boundary
\d{4}a Unicode decimal digit, repeated exactly 4 times
-the literal - (4510 / 558 / 2D16)
\d{2}a Unicode decimal digit, repeated exactly 2 times
\ba Unicode word boundary
Positive Lookahead(?=.*overall production) .*any Unicode character, repeated any number of times
overall productionthe literal text overall production (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
s modifier: single line. Allows a dot to match line terminators