Analyze some Data

Hi,\r\nI have some text files with average size of 650KB and I want to extract some info that I am interested in from these files. So, I want a program to find and extract the useful info from these files. I want to use some keywords to find the info that I am interested in (which normally is in the middle of a paragraph), then I want to use two other keywords to extract the whole paragraph. these files contain several lines of useless info and just few useful lines, but since this files produced by a software all useful part start with some keywords and will end with some other keywords. So, I can use those keywords, to extract the whole paragraph that I am in interested in (e.g. search for "Der152", then use start keyword "Sample ID" and end keyword "Date" to extract whole text that contain "Der152").\r\nfinally I want to see the result of the search (with highlight on keywords) and possibility to choose the one that I am interested in among the findings. So, I will get what you want eventually.\r\nAlos,the search engine needs to be able to:\r\n1- finds signs, too (e.g. !,@,#, =, /, -,...)\r\n2- a bit flexible in terms of searching keywords. (e.g. using "and" or "+" for searching two keywords together , and so on)\r\n \r\nUnfortunately, I can\'t share the files, but I attached what I have in my head as scratch, might be you find it helpful! \r\nand let me know if you want more details.\r\nBy the way, my platform is windows and I want to simply run it on win 7.\r\nThanks a lot for your time!\r\n\r\nRegards,\r\nNovin