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输入一个正则表达式,可以使用: 小写字母或数字,表示终结符;*,闭包;+,并集;~,补集;E,空串;O,空集 然后程序将生成 相应的NFA,以及化简之后的DFA,最后再输入一个字符串,程序判断它是否满足该正则表达式-input is a regular expression, you can use : lowercase letters or numbers, said Fu end; * Closure; , And set; To complement the set; E, empty
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1.输入文件解析
2.正则表达式转化为NFA
3.多个NFA合并
4.NFA转换DFA
5代码生成
关于输入文件格式:
没有考虑对lex输入文件的出错处理,所以输入文件务必严格书写正确。
Lex中的正规表达式使用了以下运算符:
[] | * @ ( )
并且正规表达式中不能出现其他的子正规表达式。
如果想要在待识别的正则式中使用上述运算符,请使用转义符号,即\。
例如,如果想用*,可以写成\*
,1. Analysis of the input file 2.
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输入一个正则表达式,输出相应的NFA图,NFA转换为DFA(得到的DFA图要求用画图方法完成并要求先产生子集构造表出来再画DFA图),DFA最小化(也要求用画图方法完成)
-Enter a regular expression, the output corresponding NFA map, NFA is converted to DFA (the DFA plans to be asked to use drawing methods and called for the first
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正则表达式转化为NFA,NFA转化为DFA,DFA最小化-regular expression toDFA
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正则表达式转DFA,设计原理:1正则表达式转换为带ε的NFA(Thompson构造法);2ε-NFA转为DFA;3最小化DFA;4DFA状态转换表判断是否接受输入字符串,附有详细文档说明。-Regular expressions turn DFA, design principles: a regular expression is converted to ε of the NFA (Thompson Construction Law) 2ε-NFA to DFA 3 minimal DF
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实现了正则表达式转NFA,NFA转DFA,DFA最简化的过程。并可输出DFA到图像。-It can translate Regular Expression into NFA, NFA into DFA, and minimize the DFA. The result can be printed as a graph.
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一. 实验目的: 设计、编写和调试一个具体的词法分析程序,加深对词法分析理论和自动词法分析工具的理解、实践和掌握。 二. 实验要求: ① 学习和理解正则表达式理论,写出C—语言的记号的完整的正则表达式;(适当使用正则定义) ② 学习和理解有限机理论,根据前面的正则表达式,用基于经验的方法画出C—语言的记的DFA图; ③ 用基于DFA图的算法编写C—语言的词法分析程序; ④ 学习词法分析程序的自动生成工具,使用LEX工具实现C—语言的词法分析程序.- 1. Experimental goal: T
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从正则表达式到有穷自动机实例
想研究透彻正则表达式,必须知道有穷自动机的原理,这个源码可以给你一个很好的示例参考。编译后程序会生成一个可执行文件,运行这个文件出来一个DOS窗口,然后按提示输入正则表达式。
-From regular expressions to DFA thorough study of examples like regular expressions, we must know the principles of DFA, this source can give
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输入正则表达式,转化为NFA,DFA,从测试文档中找出最大匹配子串-Enter the regular expression into NFA, DFA, document from the test to find out the biggest match Substring
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智能的词法分析 ,能任意输入正则表达式,能求出NFA,DFA,minDFA,和最后的匹配情况-Lexical analysis of intelligence, can enter any regular expression can be obtained NFA, DFA, minDFA, and the final match of the situation
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正则表达式->NFA/DFA/最简表达式-Regular Expression-> NFA/DFA/the most simple expression
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用c++实现的此法分析器,包括正则表达式解析,正则到NFA转换,NFA到DFA转换,和最终的匹配,详见包中README文件-Using c++ parser to achieve this method, including regular expression analysis, while the NFA is converted, NFA to DFA conversion, and end the match, see the package README file
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graphic Automaton simulator,NFA to DFA conversion and minimisation
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A Program that can convert your Regular Expression to PostFix Post_Fix to NFA [Thomson s Construction] NFA to DFA [Subset Construction] DFA to minDFA [Table Filling Algorithm]
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由正则表达式构造DFA的程序,并可以对输入串模拟正则表达式匹配-This is a C program used in compiling the given regular expression into an equivalent DFA, simulated through tracking State sets.
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正则表达式转NFA NFA转DFA DFA最小化
测试字符串是否匹配-Transfer NFA NFA regular expression to minimize transfer DFA DFA test whether the string matches
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有穷自动机的实现,关于正则语言的学习。有助DFA的理解-Implementation of finite automata, on the regular language learning. Facilitate the understanding of DFA
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This program is used to convert regular expression into DFA.
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1、根据要求写出词法分析的正规文法G;2、根据正规文法G,写出正则式RE;3、根据正则式RE,画出NFA;4、将NFA转化为DFA;5、将DFA转化为mininum state DFA;6、mininum state DFA就是词法分析程序的流程图,根据此流程图编写相应的词法分析程序。-1, according to the lexical analysis required to write a formal grammar G 2, according to a regular gramm
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输入正则表达式转化为DFA,最小DFA部分还不完善-Enter the regular expression into a DFA, minimal DFA part is not perfect
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