^start of string
\(?optionally matches the literal ( (4010 / 508 / 2816)
+the literal + (4310 / 538 / 2B16)
-?optionally matches the literal - (4510 / 558 / 2D16)
6the literal 6 (5410 / 668 / 3616)
\s?optionally matches any whitespace character
-the literal - (4510 / 558 / 2D16)
{8}repeats the group contents below exactly 8 times:
0-9one character from 0 (4810) to 9 (5710)
\s{0,3}any whitespace character, repeated between 0 and 3 times
$end of string, or before its final line terminator