?repeats the group contents below at most once:
\s*a Unicode whitespace character, repeated any number of times
-the literal - (4510 / 558 / 2D16)
\s*a Unicode whitespace character, repeated any number of times
£the literal £ (16310 / 2438 / A316)
\d+a Unicode decimal digit, repeated at least once
Non-Capturing Group(?:,(\d+))? ?repeats the group contents below at most once:
,the literal , (4410 / 548 / 2C16)
\d+a Unicode decimal digit, repeated at least once