Introduction - If you have any usage issues, please Google them yourself
1. Analysis of the input file 2. Regular expressions into NFA 3. More than the combined NFA conversion 4.NFA Code Generation DFA 5 on input file format: There is no consideration of the lex input file error handling, the input file must be written in strict correct. Lex in the regular expression operators used the following: [] |* @ () and regular expressions can not be a subset of other regular expressions. If you want to be identified in the regular-type operator to use the above, please use the escape symbol, that is, \. For example, if you want to use*, can be written in \*