Regexps should be tested and action taken when they fail, e.g. 
DATA: while (<DATA>) {
   chomp;
   $_ or next DATA; # allow empty lines
   /(\d\d):(\d\d):(\d\d)/ or die "corrupted data at line $.: $_\n"; # 
+but no other deviation
   my $hours = $1; 
   etc.

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In reply to Re: Regular expression and lexical variables by anonymized user 468275
in thread Regular expression and lexical variables by yoda54

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