PHP > v7.2.18 preg_match returns 2

Hi all, just found out, that function preg_match() returns not only 1 or boolean values. I did not find any documentation about some changes of this method and also the documentation is still the same. So either there are undocumented changes or it is a small bug. Documentation: https://www.php.net/manual/en/function.preg-match.php#refsect1-function.preg-match-returnvalues Tested locally with PHP 7.3.11-1+0~20191026.48+debian10~1.gbpf71ca0 <?php var_dump(preg_match('/^|\d{1,2}$/', "7")); // expected: int(1), got: int(2) Also a small test at http://sandbox.onlinephpfunctions.com/ showed a result change between PHP v7.2.18 and v7.3.5. I have checked the bugs and the changelog but could not find any notes. Best regards, Falko