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<?php
 
$n=date('Y-m-d');
$reg="/([0-9]{4})-(0[1-9]|1[0,1,2])-(0[1-9]|1[0-9]|2[0-9]|3[01])/";
var_dump(preg_match($reg, $n));

Success #stdin #stdout 0.02s 24400KB

stdin

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Standard input is empty

stdout

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int(1)

https://ideone.com/Fw5Zsn

language:

PHP (php 7.3.5)

created:

visibility:

secret

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