Bugs of preg_match (PHP-version 5.2.5)

In most cases, the following example will show one of two PHP-bugs discovered with preg_match depending on your PHP-version and configuration.

<?php

$text = "test=";
// creates a rather long text
for ($i = 0; $i++ < 100000;)
    $text .= "%AB";

// a typical URL_query validity-checker (the pattern's function does not matter for this example)
$pattern    = '/^(?:[;\/?:@&=+$,]|(?:[^\W_]|[-_.!~*\()\[\] ])|(?:%[\da-fA-F]{2}))*$/';
    
var_dump( preg_match( $pattern, $text ) );

?>

Possible bug (1):
=============
On one of our Linux-Servers the above example crashes PHP-execution with a C(?) Segmentation Fault(!). This seems to be a known bug (see http://bugs.php.net/bug.php?id=40909), but I don't know if it has been fixed, yet.
If you are looking for a work-around, the following code-snippet is what I found helpful. It wraps the possibly crashing preg_match call by decreasing the PCRE recursion limit in order to result in a Reg-Exp error instead of a PHP-crash.

<?php
[...]

// decrease the PCRE recursion limit for the (possibly dangerous) preg_match call
$former_recursion_limit = ini_set( "pcre.recursion_limit", 10000 );

// the wrapped preg_match call
$result = preg_match( $pattern, $text );

// reset the PCRE recursion limit to its original value
ini_set( "pcre.recursion_limit", $former_recursion_limit );

// if the reg-exp fails due to the decreased recursion limit we may not make any statement, but PHP-execution continues
if ( PREG_RECURSION_LIMIT_ERROR === preg_last_error() )
{
    // react on the failed regular expression here
    $result = [...];
    
    // do logging or email-sending here
    [...]
} //if

?>

Possible bug (2):
=============
On one of our Windows-Servers the above example does not crash PHP, but (directly) hits the recursion-limit. Here, the problem is that preg_match does not return boolean(false) as expected by the description / manual of above.
In short, preg_match seems to return an int(0) instead of the expected boolean(false) if the regular expression could not be executed due to the PCRE recursion-limit. So, if preg_match results in int(0) you seem to have to check preg_last_error() if maybe an error occurred.