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Defining Regular Expressions through Program In Haskell Assignment Solution

July 01, 2024
David Lee
David Lee
🇺🇸 United States
Haskell
David holds a Master's degree in Software Engineering and has been passionate about functional programming since his early studies. With over 500 WAI assignments under his belt, he excels at explaining core WAI concepts like request handling, middleware, and logging. David's expertise extends to functional testing frameworks like QuickCheck, ensuring students write well-tested and reliable WAI applications.
Key Topics
  • Instructions
  • Requirements and Specifications
Tip of the day
Always start by clearly defining agent behaviors and environment rules. Use setup and go procedures efficiently to separate initialization from execution. Regularly use the “Command Center” to test small code chunks, and don’t forget to comment your code for clarity and debugging.
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Instructions

Objective
Write a haskell assignment program that allows users to implement and define regular expressions.

Requirements and Specifications

For each of the three variables, write a regular expression (as a string) corresponding to the DFAs given below. Ensure that the regex you provide can be parsed using the parser provided in REP.hs.
For example,
*REP> parse (pREof pAlphabet) "A*B*"
Just (RSeq (RStar (RSym A)) (RStar (RSym B)))
You may use any of the posted sample code to check your answers, but only submit the regular expressions themselves.
regex1 should correspond to this DFA:
regex1-1
regex2 should correspond to this DFA:
regex2-2
regex3 should correspond to this DFA:
regex3-3
Screenshots of output
Define-regular-expressions-in-Haskell
Source Code
module HW5 where
-- imports added for doing tests in ghci
import Parser
import RE
import REP
regex1 = "(B|A+B)*"
regex2 = "A+B+|B+A+|e"
regex3 = "(BA)*(e|AA(BA|AA(BA)*AA)*(e|AA(BA)*))"

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