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Doc Bug #16590 Problems with strings containing \x00
Submitted: 2002-04-13 13:06 UTC Modified: 2002-05-24 15:20 UTC
From: daniel at lorch dot cc Assigned:
Status: Closed Package: Documentation problem
PHP Version: 4.1.2 OS: Linux
Private report: No CVE-ID:
 [2002-04-13 13:06 UTC] daniel at lorch dot cc
The PCRE has problems with strings containing 0x00. It stops reading as if the strings were \0 terminated. This affects all preg_* functions.


  preg_match("/\x00/", "foo");
  preg_match("/" . chr(0) . "/", "foo");

Raises the error "Warning: No ending delimiter '/' found"


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 [2002-04-13 13:23 UTC]
Actually, I'm not sure whether this problem can be solved as it is PCRE and not a PHP specific (and it can't be solved without breaking compatibilty with languages using 0 terminated strings such as C).

I'm thinking about making it a documentation problem. What do you guys think?

 [2002-04-13 15:59 UTC]
The docs state that PCRE is binary safe. So this might be a bug after all...
 [2002-04-13 16:27 UTC]
pcre is binary safe with regards to the string being matched against, but not the pattern. this is a limitation of the pcre library itself, not just the php interface. you can specify the nul character using:

preg_match("/\\x00/", "foo\0bar")

reclassified as documentation problem.
 [2002-05-24 15:20 UTC]
This bug has been fixed in CVS. You can grab a snapshot of the
CVS version at In case this was a documentation 
problem, the fix will show up soon at
In case this was a website problem, the change will show
up on the site and on the mirror sites.
Thank you for the report, and for helping us make PHP better.

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