词法分析器的JAVA实现，，程序利用正则表达式实现了简单的词法分析器。-JAVA implementation of lexical analyzer, and procedures to use regular expressions to achieve a simple lexical analyzer.

词法分析器，主要用Java编写的源程序，对词进行逐个的分析-Lexical analyzer, the main use of Java source code written for the analysis of the words one by one