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<?php
$regex = '~\d{4}\h\d{9}~';
$str = '0521 123456789';
preg_match($regex, $str, $match);
print_r($match);

Success #stdin #stdout 0.02s 52432KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => 0521 123456789
)

https://ideone.com/kwDOQB

language:

PHP (php 7.3.5)

created:

visibility:

public

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