能够完成正则文法所描述的Pascal语言子集单词符号的词法分析，该语言大小写不敏感，能够识别的字符以二元式的形式输出到屏幕上和中间文件里。-Able to complete the grammar is described in a subset of Pascal language lexical analysis of word symbols, the language is not case sensitive, able to identify the characters in th