Simple Web Extractor

Hello, I am looking for a simple web extractor that should retrieve data from a specified page (with a parameter that can change), parse them and extract into two files - see the attached spec for more details and samples. I know very well of what I am looking for so in case of any question please just ask, the trouble is the source page is in my native language (which is unfortunately not English.. ;)) but I guess it is not needed. The assumed delivery is a script that I can run from command line on Windows (no GUI needed at all), preferred is e.g. Python/Ruby/etc. script that I can easily adapt in case of some minor changes are needed without a need to install any "sophisticated" development studio. Thanks a lot.