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Bug #36703 Can't include a literal plus sign in a character class
Submitted: 2006-03-12 09:01 UTC Modified: 2006-03-20 01:00 UTC
Avg. Score:4.0 ± 1.0
Reproduced:4 of 4 (100.0%)
Same Version:4 (100.0%)
Same OS:3 (75.0%)
From: 5jpck6k02 at sneakemail dot com Assigned:
Status: No Feedback Package: PCRE related
PHP Version: 5.1.2 OS: Linux
Private report: No CVE-ID: None
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 [2006-03-12 09:01 UTC] 5jpck6k02 at sneakemail dot com
A simple regular expression that has worked for years in PHP 4 
suddenly fails under PHP 5. 

Reproduce code:
foreach($_GET as $val)
		if ( preg_match("/[^a-z0-9_\-\+]/i", $val) )
			die("<p>Invalid request.</p>");

Expected result:
The above code is used to filter out bogus GET requests 
containing potential XSS attacks at the top of a script. It 
should allow all legitimate requests comprised of alphanumeric 
characters, underscores, and plus and minus signs, through, 
while kicking anything containing a character not included in 
the character class out,

Actual result:
The regex matches plus signs contained in query strings even 
though the plus sign is explicitly included in the negated 
character class. I believe it is being interpreted as a 
quantifier when it is meant to be taken literally, I have not 
been able to find any means of successfully including a 
literal plus sign in a character class under PHP 5 to date. 


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 [2006-03-12 09:13 UTC]
Not enough information was provided for us to be able
to handle this bug. Please re-read the instructions at

If you can provide more information, feel free to add it
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 [2006-03-20 01:00 UTC] php-bugs at lists dot php dot net
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
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