!!! I have a urgence problem !!!

Please show this statements:

$sql = "UPDATE TFrusti SET entity='FAN', SYSFLD001='Test with Clob-Data Entity just for test!' WHERE SYSPID = 411";
preg_match("/^UPDATE\s(\w+)\sSET\s(.*?)([WHERE.*|$])/s",$sql,$matches);

my problem now is, if in the subject (here the value of the $sql) is the word "Entity" this expression deliver just a truncated match, but if the word "entity" ist in lower-case inside the $sql-Variable the expression deliver the correct matches!!!!

Results:
$matches[2] with lower-case "entity" shows following value: "entity='FAN', SYSFLD001='Test with Clob-Data Entity just for test!'"

$matches[2] with upper-case "Entity" shows this values:
entity='FAN', SYSFLD001='Test with Clob-Data"

Have anyone a answer or know this problems?

Thanks and best regards,
Frast Andreas