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some algorithm implementations for automaton and regular expressions

Project description

Introduction

This is a simple regular expression program. It implements NFA to DFA, DFA minimization and automaton visualization.

To enable plotting feature, you may need to install graphviz

Usage

from automaton_tools import DFA as MyDFA
myinput = "abc12.+qs{2,}(yui){1,2}?"
dfa = MyDFA.fromRegex(myinput)

# check whether the string matches the pattern from the beginning or not
ismatch = dfa.match("yuiyui")

# plot the transition graph
dfa.drawGraph("dfa")
# it will generate dfa.png file

Known bug

It cannot handle . or \w properly. Because they are considered as a special kind of characters.

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