^start of string
\+?optionally matches the literal + (4310 / 538 / 2B16)
8?optionally matches the literal 8 (5610 / 708 / 3816)
\s?optionally matches any whitespace character
-?optionally matches the literal - (4510 / 558 / 2D16)
Group 1(90|91|93|94|95|98|99|33|97|71) \s?optionally matches any whitespace character
-?optionally matches the literal - (4510 / 558 / 2D16)
\d{3}a digit, repeated exactly 3 times
\s?optionally matches any whitespace character
-?optionally matches the literal - (4510 / 558 / 2D16)
\d{2}a digit, repeated exactly 2 times
\s?optionally matches any whitespace character
-?optionally matches the literal - (4510 / 558 / 2D16)
\d{2}a digit, repeated exactly 2 times
$end of string, or before its final line terminator