Try unless instead of if. 
print OUT unless (/phn_a/ .. /1ord/);

[download]
UPDATE: more detailed: 
#!/usr/bin/perl

use strict;
use warnings;

while (<DATA>) {
  print unless (/phn/ .. /1ord/);
}

__DATA__
black
# input phn
blue
red
green
# 1ord
yellow
white

[download]

In reply to Re: extracting lines by neniro
in thread extracting lines by Anonymous Monk

Title:
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