What Perl variables are used for the positions of the start and end of last successful regex match?

Question

What Perl variables are used for the positions of the start and end of last successful regex match?

Answer 1

As the perlvar man-page explains:

$+[0] is the offset into the string of the end of the entire [last successful] match. This is the same value as what the pos function returns when called on the variable that was matched against.

$-[0] is the offset of the start of the last successful match.