If you need to extract information from remote webpages you can read this article about how to do it with PHP and XPath. The autor explains how extracting information can be very easy and it can be done in no time (less then 5 minutes) with the mentioned tools and without the use of regular expressions.
Laszlo Bodor
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Have you looked at YQL. You can query regular broken html content with xpath. Then use the result in Yahoo Pipes I suppose …