A nice way to parse the coordinates is using Regexp::Common. 
use Regexp::Common;
...
my $num = $RE{num}{real};
my ($x, $y, $z) = ($1, $2, $3) if $line =~ /($num) ($num) ($num)\s*$/;

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In reply to Re^2: substr in nested foreach loop by codeacrobat
in thread substr in nested foreach loop by sarani

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