[SOLVED] preg_match crashes PHP

[phant0m]

I have reinstalled my computer and therefore a newer version of XAMPP.

 

This now leads to strange results with preg_match.

Consider the following code:

<?php
$string = 'asdfsadfasdf asdfa adsf dsa fdsa fdsa dsa fdsa fdsaf dsa dsa fdsa fdsaf sad fdsf sad dsfgdsfg 
asdfsadfadfsadfasdadffa aa fddsaf sad fdsf sadfasdf asaaaaadfa adsf dsa fdsa fdsa dsa fdsaa  dsa faaaaaaaadaaaaaaaaaaaasaf dsa faaaaadaaaaaaaaaasaf dsa dsa fdsa fdsaf sad fdsf sad daaaaasfgdsfg asdfsadfaaaasdf asdfa adsf dsa fdsa fdsa dsa fdsa fdsaf dsa dsa fdsa fdsaf sad fdasf asad dsfgdsfg aaaaaa';
 $pattern=  preg_match('%^(?:
              [\x09\x0A\x0D\x20-\x7E]            # ASCII
            | [\xC2-\xDF][\x80-\xBF]             # non-overlong 2-byte
            |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
            | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
            |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
            |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
            | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
            |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
      )*$%xs';
preg_match($pattern, $string);

?>

 

This code works. However, if I was to insert one single character more in $string, PHP crashes without telling me why.

 

 

[Wed Jul 22 21:51:08 2009] [notice] Parent: child process exited with status 3221225477 -- Restarting.

 

 

 

 

The string is very often much longer than that, and online it works flawlessly.

 

This is online:

PHP Version 5.2.6

 

PCRE Library Version 6.6 06-Feb-2006

pcre.backtrack_limit 100000

pcre.recursion_limit 100000

 

This is offline:

PHP Version 5.2.9

 

PCRE Library Version 7.8 2008-09-05

pcre.backtrack_limit 100000

pcre.recursion_limit 100000

 

any ideas?

[phant0m]

no one?

[Mark Baker]

I encountered a similar problem, trying to validate utf-8: on some servers the preg_match ran without problems, on others it simply crashed without error. Suspected that it was related to the regexp library versions, but resolved it by using

$charset = (mb_check_encoding($string,'ISO-8859-1')) ? 'ISO-8859-1' : 'UTF-8';

instead

 

[thebadbad]

I'm guessing the forum messed with your code? 'Cause it would throw a syntax error the way it is there.

[phant0m]

ah yes, you need to remove preg_match( from $pattern =  - sorry for that

(why can't I edit my post?)

 

@Mark: thanks, I'll try that.

[phant0m]

Thanks, it worked!

Let's just hope I don't run into other problems with regex.

[saratis]

Could go into a little more detail as to how you implemented this? Im having the same problem.

 

Thank you