help! strange preg_match no match problem!

Hi, All,
I encountered this strange problem while using function preg_match in
InlineParser.php.
I isolates the problem and put it in the following php code.

</p>match result
<?php
$text = str_repeat('*', 12500);
$regexp = "/ ( . *? ) ( ($)|(~(?: [[:alnum:]]+ | .))|(\\#? \\[ .*? [^]
\\s] .*? \\]) ) /Asx";

if($text and $regexp)
  $ret = preg_match($regexp, $text, $m);

echo $ret;
?> <br />

</p>regexp is <?php echo $regexp; ?> <br />
</p>text length <?php echo strlen($text) ?> <br>
<?php   echo "count ".count($m)."<br>";
        for ($i=0; $i<count($m); $i++) {
        $str=$i.htmlentities($m[$i])."<br>";
        echo $str;
        } ?> <br /> 


when I set the line:
$text = str_repeat('*', 12500);

preg_match will return 0 for the hard coded regular expression.

but if I set $text to 12499, it will return 1 for a match.
$text = str_repeat('*', 12499);

anybody know what's the problem?

Thanks!



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