Non-Capturing Group(?:\bserial 7's |\G(?!^)) 1st Alternative\bserial 7's \ban ASCII word boundary
serial 7's the literal text serial 7's (case sensitive) \Gstart of current search
-?optionally matches the literal - (4510 / 558 / 2D16)
\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match
\d+a digit, 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