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Bug #32875 Repetition quantifiers
Submitted: 2005-04-28 20:52 UTC Modified: 2005-04-28 20:58 UTC
From: chiaroscuro at achromatic dot fsnet dot co dot uk Assigned:
Status: Not a bug Package: PCRE related
PHP Version: 4.3.10 OS: Apache 1.3.31
Private report: No CVE-ID: None
 [2005-04-28 20:52 UTC] chiaroscuro at achromatic dot fsnet dot co dot uk
I'm using quantifiers in preg_match_all functions,amongst other things, to restrict the length of strings strings submitted from HTML forms. The lower limit catches discrepant strings, but the upper limit has no effect. I've tried using very basic code, but unsuccessfully.

Reproduce code:
$failure = 0;
$userpattern = "/t{3,6}/";
$username = 'ttttttt';
$usercheck = preg_match_all($userpattern,$username,$results);
if ( !$usercheck )
{	$failure++;	}

Expected result:
$usercheck = 'tt';
This would be a disallowed string
$usercheck = 'ttttttt';
This would also be a disallowed string

Actual result:
$usercheck = 'tt'; results in $failure == 1 & the string 'fails' as it should.
$usercheck = 'ttttttt'; results in $failure = 0 & the string is allowed.
This happens however many repetitions the string comprises and with any upper limit set.


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 [2005-04-28 20:58 UTC]
Anchor your regex using ^ and $
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