I'm parsing time from a last output. I got an unexpected input, so getting an unexpected output shouldn't be surprising, but for the life of me I can't figure out what perl is doing.

subroutine is

sub minutes {
  my $time = shift;
  print "minutes handed $time " if $DEBUG_MINUTES;
  if ( $time =~ /(\d+):(\d+)/ ) {
    print "Interpreted as $1 hours $2 mins\n" if $DEBUG_MINUTES;
    return 60 * $1 + $2;
  } elsif (/(\d+)+(\d+):(\d+)/) {
    print "Interpreted as $1 days, $2 hours, $3 minutes\n" if $DEBUG_M
+INUTES;
    return ( 24 * $1 + $2 ) * 60 + $3;
  } else {
    warn "I don't understand time $time\n";
    return $time;
  }
}

[download]
I was processing a line 
archerh                                Thu Jun 22 10:25 - down  (-6+-1
+2:-52)

[download]
and I get 
minutes handed -6+-12:-52 Interpreted as 1 days, 0 hours, 25 minutes

[download]
How does \d+ do this?

In reply to unexpected RE match by WoodyWeaver

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