Influenced by MBasic

I wondered how MBasic interpret strings ( Basic code. ). I wanna see how it work so I use GNU/Linux, which is free software. Although there is no MBasic in Linux Distro but there are plenty of another interpreter to hack. My main job is also about string manupulating. Today I 'm writing program to generate parse tree from Earley parsing result. I go on manipulate string, not because that I can do well but just because I wanna do. :-P