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  1. or download this
    $s = "Test-01-xxx";
if ($s =~ /-(\d\d)-/g) {
  print "Pos: $pos - ", pos( $s )-3, "\n";
}
  2. or download this
    $s = "Test-01-xxx";
if ($s =~ /(.*?)-(\d\d)-(.*)/g) {
...
  print "Number part : $2\n";
  print "Right part : $3\n";
}
  3. or download this
    $s = "Test-01-xxx";
# Method 1, possibly slow
...
if ($s =~ /(-(\d\d)-)/g) {
  print "Pos: $pos - ", pos( $s )- length( $1 ), "\n";
}