From:             fabriziodimeo at alice dot it
Operating system: windows and linux
PHP version:      5.3.1
PHP Bug Type:     *Regular Expressions
Bug description:  preg_match doesn't work...le't post an example

Description:
------------
preg_match do not match correctly.

Reproduce code:
---------------
<?php
function anti_injection($stringa) {
$pattern="/[A-Za-z0-9]/";
if (preg_match($pattern, $stringa)) {
echo "ok"; } 
                 else {
                 
                 echo "hacking";
                      }
}


$str="c";
anti_injection($str);

$str="ciao!";
anti_injection($str);

?> 

Expected result:
----------------
ok
hacking

Actual result:
--------------
ok
ok

-- 
Edit bug report at http://bugs.php.net/?id=51148&edit=1
-- 
Try a snapshot (PHP 5.2):            
http://bugs.php.net/fix.php?id=51148&r=trysnapshot52
Try a snapshot (PHP 5.3):            
http://bugs.php.net/fix.php?id=51148&r=trysnapshot53
Try a snapshot (PHP 6.0):            
http://bugs.php.net/fix.php?id=51148&r=trysnapshot60
Fixed in SVN:                        
http://bugs.php.net/fix.php?id=51148&r=fixed
Fixed in SVN and need be documented: 
http://bugs.php.net/fix.php?id=51148&r=needdocs
Fixed in release:                    
http://bugs.php.net/fix.php?id=51148&r=alreadyfixed
Need backtrace:                      
http://bugs.php.net/fix.php?id=51148&r=needtrace
Need Reproduce Script:               
http://bugs.php.net/fix.php?id=51148&r=needscript
Try newer version:                   
http://bugs.php.net/fix.php?id=51148&r=oldversion
Not developer issue:                 
http://bugs.php.net/fix.php?id=51148&r=support
Expected behavior:                   
http://bugs.php.net/fix.php?id=51148&r=notwrong
Not enough info:                     
http://bugs.php.net/fix.php?id=51148&r=notenoughinfo
Submitted twice:                     
http://bugs.php.net/fix.php?id=51148&r=submittedtwice
register_globals:                    
http://bugs.php.net/fix.php?id=51148&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=51148&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=51148&r=dst
IIS Stability:                       
http://bugs.php.net/fix.php?id=51148&r=isapi
Install GNU Sed:                     
http://bugs.php.net/fix.php?id=51148&r=gnused
Floating point limitations:          
http://bugs.php.net/fix.php?id=51148&r=float
No Zend Extensions:                  
http://bugs.php.net/fix.php?id=51148&r=nozend
MySQL Configuration Error:           
http://bugs.php.net/fix.php?id=51148&r=mysqlcfg

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