Description:
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The exact same pattern matching is not working on the same string, with a extra line at the end. 
The length of the string seems to be the problem.

Reproduce code:
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The script:
$handle = fopen('test3.xml', "r");
$contents = fread($handle, filesize('test3.xml'));
fclose($handle);
$contents = preg_replace('/\>[\t|\ |\s]{1,}\</', "><", $contents);
$contents = preg_replace('/\n/', "", $contents);
if(preg_match('/(\<\?xml.{1,}\<report[^>]{1,}\>)/', $contents, $match)) {
    print "Match: $match[1]\n";
} else {print "Fail\n";}

OBSERVATION: If you delete the last line from the file test3.xml, the pattern matching will work fine. The last lines have nothing to do with the pattern.

You can find the file here: 
http://www.casnt.ro/Files/XML/test3.xml

Expected result:
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Match: <?xml version="1.0" encoding="utf-8"?><report AppKey="CNAS-v1.0.2801.665" AppID="14" clinic="SSSSSSSSSSSSSSSSSSSSSS" fiscalCode="11111111" contractNo="123123123/2008" insuranceHouse="CAS-NT" reportingDate="2008-12-07" startFrom="2008-11-01" endTo="2008-11-30" invoiceNo="" labValue="0" hspValue="0" xmlns="http://localhost">


Actual result:
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Fail