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  1. <?php
  2.  
  3. $arr = array("42342535425234", "задание 42342535425234 тест", "123456", "задание №123456 тест", "задание №123456тест", "задание123456тест", "задание123456");
  4. $pattern = '~(?<!\d)[1-9]\d{5}(?!\d)~';
  5. foreach ($arr as $s) {
  6. 	echo $s . ": " . preg_match($pattern, $s) . PHP_EOL;
  7. }
Success #stdin #stdout 0s 82944KB
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stdin
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Standard input is empty
stdout
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42342535425234: 0
задание 42342535425234 тест: 0
123456: 1
задание №123456 тест: 1
задание №123456тест: 1
задание123456тест: 1
задание123456: 1
https://ideone.com/n3UsOm
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
secret

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