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<?php
 
$text = "123|@rand(тест {@rand(номер 1234|номер 4321)}|строка||";
print_r(preg_split('~{@\w+\(.*?\)}(?![^|])(*SKIP)(*F)|\|~u', $text));

Success #stdin #stdout 0.02s 25776KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => 123
    [1] => @rand(тест {@rand(номер 1234|номер 4321)}
    [2] => строка
    [3] => 
    [4] => 
)

https://ideone.com/Y8CUYN

language:

PHP (php 7.3.5)

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public

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