Corrections in PHP script for better accuracy

We use a PHP-script for finding positions of sertain search phrases in Google. I need some corrections done to the script because it has some serious flaws. I have posted about this job here once before, and the winner of the bid gave up on the job. To be able to do the job I believe we need someone that are very good at regulat expressions and are very familiar with stripping out content from webpages. I am pretty sure what the problem with the script is, I just don't know enough PHP to be able to do anything about it. For a seasoned programmer I am pretty sure it can be fixed in a few minutes. This is what I know about the problem so far: 1. Sometimes the script can't find the url we are looking for - even if it's there. 2. The script reports a different position than what you will find doing a manual count in Google. The file that needs fixed is attached. The string used to call the script is: [login to view URL];searchurl=www.domain.com&Language=en&Searchsite=www.google.com&Submit=Search