Picking a phrase out of a web page.

I am trying to write a function to parse an arbitrary web page and extract information. As a for instance, if I file() a page on amazon.com I want to go over each line (array element) and if it sees Price: $xx.xx I want to pull out $xx.xx. I was thinking of a foreach statement with strstr to test for the string, but would appreciate any pointers anybody might be able to give. Thanks, -Dan Anderson