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Bug #862 problem in eregi()
Submitted: 1998-10-20 17:17 UTC Modified: 1998-10-29 22:04 UTC
From: markjr at easyDNS dot com Assigned:
Status: Closed Package: Misbehaving function
PHP Version: 3.0.5 OS: linux 2.0.35
Private report: No CVE-ID: None
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From: markjr at easyDNS dot com
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 [1998-10-20 17:17 UTC] markjr at easyDNS dot com 
eregi("[^a-z0-9\.\-]", "test-ing") returns false
eregi("[^a-z0-9\-\.]", "test-ing") returns true

Switching the escaped "." and "-" causes the
pattern to fail erroneously. The behaviour goes
away if you use an inclusive regex (read:
lose the "^")

here's a short script to test with 

<?
function isValidAddr ($addr) {
        if(eregi("[^a-z0-9\-\.]",$addr)):
                return(false);
        else:
                return(true);
        endif;
        };

echo isValidAddr("Tesdt-jkjk") ? "true" : "false";
?>

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 [1998-10-29 22:04 UTC] rasmus 
You have a number of problems in your regular expressions there.  First, there is no such thing as \- and even if there was you would have to write it as \\- because inside a double-quoted string in PHP escape chars are parsed.  In order to get the eregi() function to see \- you would have to escape the \ and thus have \\-.  That isn't you problem though.  I quote from the Extended Regular Expression docs (see regex/regex.7 in the PHP distribution):
To  include  a  literal `]' in the list, make it the first
character (following a possible `^').  To include  a  lit-
eral `-', make it the first or last character, or the sec-
ond endpoint of a range.  To use  a  literal  `-'  as  the
first  endpoint of a range, enclose it in `[.' and `.]' to
make it a collating element (see below).  With the  excep-
tion  of  these  and some combinations using `[' (see next
paragraphs), all other special characters, including  `\',
lose  their  special significance within a bracket expres-
sion.
So, this tells you that you cannot put a '-' in the middle of a range like that.  I do not think this is a bug in PHP.  PHP's behaviour is entirely consistent with that definition.
 [2023-03-06 07:15 UTC] asghhs at gmail dot com 
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