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  1. <?php
  2.  
  3. $data = <<<DATA
  4.  pblxare.eus.	86400	in	ns	ns1.cdmon.net. pblxare.eus.	86400	in	ns	ns2.cdmon.net. pblxare.eus.	86400	in	ns	ns3.cdmon.net. eginirribarre.eus.	86400	in	ns	alt.guebs.com. eginirribarre.eus.	86400	in ns	alt2.guebs.com. eginirribarre.eus.	86400	in	ns	alt3.guebs.com. n80i564smh8rfmcej1l.eus.	43200	in	nsec3	1	0	12	e5b2f7n	ns n8g4vh050i5641l.eus.	43200	in	rrsig	nsec3	10	2 frgrgrht.eus. 86400
  5. DATA;
  6.  
  7. $regex = "~(\S+\.(?:eus|tld))\.\s*86400(?!.*?\1\.\s*86400)~ms"; 
  8.  
  9. preg_match_all($regex, $data, $matches);
  10. print_r($matches);
  11.  
  12. ?>
Success #stdin #stdout 0s 52488KB
comments ()
stdin
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Standard input is empty
stdout
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Array
(
    [0] => Array
        (
            [0] => pblxare.eus.	86400
            [1] => pblxare.eus.	86400
            [2] => pblxare.eus.	86400
            [3] => eginirribarre.eus.	86400
            [4] => eginirribarre.eus.	86400
            [5] => eginirribarre.eus.	86400
            [6] => frgrgrht.eus. 86400
        )

    [1] => Array
        (
            [0] => pblxare.eus
            [1] => pblxare.eus
            [2] => pblxare.eus
            [3] => eginirribarre.eus
            [4] => eginirribarre.eus
            [5] => eginirribarre.eus
            [6] => frgrgrht.eus
        )

)
https://ideone.com/qgYYLW
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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