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<?php
$re = "/^(?!.*\\d{7}).*/m"; 
$str = "1234567\n123456\n12345673536"; 
 
preg_match_all($re, $str, $matches);
print_r($matches);

Success #stdin #stdout 0s 52488KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => Array
        (
            [0] => 123456
        )

)

https://ideone.com/bZam0o

language:

PHP (php 7.3.5)

created:

visibility:

public

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