I want to extract the two right most digits after the minus sign

A number of regexp examples have been given, but if you know your data, there are simpler ways. If you know the last two characters are the digits:

my $two = substr($val, -2);

Or, if you know the last two characters are digits if the third-last character is a dash:

my $two = substr($val, -2)
  if substr($val, -3, 1) eq '-';
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