This 
     if ($str =~ /nbk[A-z0-9]{4}/ or /nbd[A-z0-9]{4}/ or /root/){

[download]

is the same as 

     if ($str =~ /nbk[A-z0-9]{4}/ or $_ =~ /nbd[A-z0-9]{4}/ or $_ =~ /
+root/){

[download]

which not what I think you're after. Perhaps you meant

     if ($str =~ /nbk[A-z0-9]{4}/ or $str =~ /nbd[A-z0-9]{4}/ or $str 
+=~ /root/){

[download]

In reply to Re: Not matching REGEX by FunkyMonk
in thread Not matching REGEX by cutter

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