Description:
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When I change $n_times to 80000, and run the command line script php -f myscript.php, I get "Segmentation Fault".  The error also occurs when run via apache: [Fri Aug 19 15:05:14 2011] [notice] child pid 11995 exit signal Segmentation fault (11)

If you change $n_times to be sufficiently large, preg_match seems to consistently seg fault.

If I change $n_times to  something lower like 1000, there is no seg fault.

Test script:
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<?php
$n_times = 80000;
$string = str_repeat('a',$n_times);

//regex from: http://w3.org/International/questions/qa-forms-utf-8.html
echo 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', $string) ? 'y' : 'n';
die("\n");


Expected result:
----------------
'y' or 'n'

Actual result:
--------------
command line:
Segmentation Fault

via apache error.log
[Fri Aug 19 15:05:14 2011] [notice] child pid 11995 exit signal Segmentation fault (11)