73:     #initialize a value to count where we are in the array in orde
+r to
74:     #delete the lines we do not need
75:     my $i = 0;
76:     my $item;
77:     my $item2;
78:     foreach $item (@data_file){
79:             foreach $item2 (@lines){
80:                     if ($item =~ /$item2/){
81:                             splice(@data_file,$i,1);
82:                     }
83:             }
84:             $i++
85:     }

[download]

From the perlsyn man page:   <QUOTE>If any part of LIST is an array, "foreach" will get very confused if you add or remove elements within the loop body, for example with "splice". So don’t do that. </QUOTE> Also you should quotemeta any outside data used in a regular expression.

You can accomplish what you want like this: 

    #initialize a value to count where we are in the array in order to
    #delete the lines we do not need
    foreach my $index ( reverse 0 .. $#data_file ) {
        foreach my $item ( @lines ) {
            if ( $data_file[ $index ] =~ /\Q$item/ ) {
                splice @data_file, $index, 1;
            }
        }
    }

[download]

In reply to Re: Why does the array not reset each time I call the function? by jwkrahn
in thread Why does the array not reset each time I call the function? by tuxy94

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