Introduction - If you have any usage issues, please Google them yourself
Lexical analysis is a compiler of the first processing stage, can be two ways to construct the lexical analysis process. One is based on the language to describe certain types of word or definition (such as the BNF), constructed by hand the way lexical analysis program. For example, according to the grammar or the state transition diagram corresponding state matrix structure, the state matrix with the control program will be composed of a compiler lexical analysis procedures