while(<IN>)
{
undef ($/);
$string=$_;

[download]

Because you undef $/ inside the loop that means that the first time through the loop $_ will contain only the first line of the file and the second time through the loop $_ will contain all the rest of the file.

Did you really want to process the file in two chunks like that?

In reply to Re: multiple OR match fails by jwkrahn
in thread multiple OR match fails by zzgulu

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