You could Explode it using '&IWANTTHIS=' as the delimiter.
Then Explode the second element in the resulting array using '&thisthatandother=' as the delimiter.
The value you want would then be the first element of the resulting array
something like -
PHP Code:
$array1 = explode ("&IWANTTHIS=", $field);
$final_array = explode ("&thisthatandother=", $array1[1]);
$myvalue = $final_array[0]
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