code file search tool (keywords, regular express)

I need a java tool to analyze thousand of source code files which including .apsx .cs .vb .js .java .jsp and so on. two types of search 1. regular express search (more important) 2. keyword search I want the tool is configurable, there better be a conf file or properties files that the user can define - search path (might be multiple path) - search keyword for different file type. eg for .aspx we search "test.*" for .vb we search "hello.%" - output file name location and so on. Output format: I need file name, full path, line # and others you can get. performance: faster is better. this will run on Linux , the program should be easy to read and well organized.