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Bug #14173 preg_match incorrectly parses data with binary zero
Submitted: 2001-11-22 06:23 UTC Modified: 2002-01-15 10:41 UTC
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: frog at enlight dot ru Assigned:
Status: Closed Package: PCRE related
PHP Version: 4.0.6 OS: Win98
Private report: No CVE-ID: None
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 [2001-11-22 06:23 UTC] frog at enlight dot ru
$data = "abc\0\0de";  # \0, \x00 - never mind
preg_match('/ab(.{4})e/s', $data, $res);

echo(bin2hex($data));   # 61626300006465
echo(bin2hex($res[0])); # 616263
echo(bin2hex($res[1])); # 63

PHP4.0.6/Win32 (binary distr.)

From PHP PCRE docs:

4. Though binary zero characters are supported in the subject string, they are 
not allowed in a pattern string because it is passed as a normal C string,
terminated by zero. The escape sequence "\0" can be used in the pattern to
represent a binary zero.

From original PCRE docs (


The subject string is passed as a pointer in subject, a
length in length, and a starting offset in startoffset.
Unlike the pattern string, the subject may contain binary
zero characters. When the starting offset is zero, the
search for a match starts at the beginning of the subject,
and this is by far the most common case.


by the way, it seems that preg_replace() works correctly. Problems with preg_match()

please report if i'm wrong and it isn't a bug.


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 [2002-01-15 10:41 UTC]
Fixed in CVS - thanks.
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