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 \*

Lex.cpp
lex.h
lex.yy.cpp
lex使用说明.doc
lex实验报告.doc
test.txt
yytab.h

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