[PHP-BUG] Bug #77726 [NEW]: Warning: preg_match(): Null byte in regex

From:             605036592 at qq dot com
Operating system: CentOS-7.4-x86_64
PHP version:      7.2.16
Package:          PHP Language Specification
Bug Type:         Bug
Bug description:Warning: preg_match(): Null byte in regex

Description:
------------
when I use preg_match pattern 0x0, Warning: preg_match(): Null byte in
regex
regex has match all character, why php not allow 0x0? it's a bug or has
any reason? 

Test script:
---------------
preg_match("/a".chr(0)."bc/", 'abc');

Expected result:
----------------
I expect preg_match right return 0 or 1 and not warning

Actual result:
--------------
Warning: preg_match(): Null byte in regex

-- 
Edit bug report at https://bugs.php.net/bug.php?id=77726&edit=1
-- 
Try a snapshot (PHP 5.4):   https://bugs.php.net/fix.php?id=77726&r=trysnapshot54
Try a snapshot (PHP 5.5):   https://bugs.php.net/fix.php?id=77726&r=trysnapshot55
Try a snapshot (trunk):     https://bugs.php.net/fix.php?id=77726&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=77726&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=77726&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=77726&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=77726&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=77726&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=77726&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=77726&r=notwrong
Not enough info:            https://bugs.php.net/fix.php?id=77726&r=notenoughinfo
Submitted twice:            https://bugs.php.net/fix.php?id=77726&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=77726&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77726&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=77726&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=77726&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=77726&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=77726&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=77726&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=77726&r=mysqlcfg