Description:
------------
The regular expression ~[^/p{Han}/p{Z}]~u will match a single character not present in the list below:
 -Any characters in the Han script.
 -Any kind of whitespace or invisible separator

In fact, when pcre.jit is enabled, this regular expression will match a whitespace, which may be an incorrect match.

pcre:

PCRE (Perl Compatible Regular Expressions) Support => enabled
PCRE Library Version => 10.34 2019-11-21
PCRE Unicode Version => 12.1.0
PCRE JIT Support => enabled
PCRE JIT Target => x86 64bit (little endian + unaligned)

Directive => Local Value => Master Value
pcre.backtrack_limit => 1000000 => 1000000
pcre.jit => 1 => 1
pcre.recursion_limit => 100000 => 100000



Test script:
---------------
pcre_jit_off.php:
<?php
ini_set('pcre.jit', 0);
preg_match('~[^\p{Han}\p{Z}]~u', '     ', $matches);
var_dump($matches);

pcre_jit_on.php:
<?php
ini_set('pcre.jit', 1);
preg_match('~[^\p{Han}\p{Z}]~u', '     ', $matches);
var_dump($matches);

Expected result:
----------------
pcre_jit_off.php: 
array(0) {
}

pcre_jit_on.php:
array(0) {
}

Actual result:
--------------
pcre_jit_off.php:
array(0) {
}

pcre_jit_on.php:
array(1) {
  [0]=>
  string(1) " "
}