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(my $secs = "5H3M17S") =~ s/((\d+)H)?((\d+)M)?((\d+)S)?/3600*$1 + 60*$
+3 + $5/e;

use strict;

...
my $exponent = 0;

map { $secs += $_ * 60 ** $exponent++ } reverse(split(/[HMS]/, $time))
+;