Description:
------------
As of PHP 7.3.0, preg_match() may return an integer greater than
one on success[1], although the documentation states[2]:

| preg_match() returns 1 if the pattern matches given subject, […]

This issue has been reported by Falko Matthies.

[1] <https://3v4l.org/cKarY>
[2] <https://www.php.net/manual/en/function.preg-match.php#refsect1-function.preg-match-returnvalues>


Test script:
---------------
var_dump(preg_match('/^|\d{1,2}$/', "7"));


Expected result:
----------------
int(1)

Actual result:
--------------
int(2)