Task 04 – Pattern-Matching Chatbot

Student: bharat singh chouhan
Student ID: CA/DE1/1099
Domain: Python Programming

Project Description

This project is a simple pattern-matching chatbot built using Python.
Instead of basic if-else replies, the chatbot uses Regular Expressions (Regex) to understand user messages.
It detects greetings, identity questions, exit messages, and general queries using pattern matching and responds accordingly.

This is a part of the CodeAlpha Python Programming Internship.

Features

• Regex-based pattern recognition
• Handles greetings, questions, thanks, and exit commands
• Clean knowledge base for easy expansion
• Converts input to lowercase for reliable matching
• Continues conversation until the user exits
• Includes a fallback response for unknown messages

How It Works

1. User input is converted to lowercase
2. Each regex pattern in the KNOWLEDGE_BASE is checked
3. The first matching pattern returns the response
4. If nothing matches, a default fallback reply is sent

How to Run

Open terminal inside the project folder and run:

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Example Interaction

You: hello Bot: Hello there! How may I assist you today?

You: how are you Bot: I am an AI, so I don't have feelings, but I'm functioning perfectly! Thanks for asking!

You: your name Bot: I am a simple Pattern-Matching Chatbot, created using Python for the CodeAlpha task.

You: bye Bot: Goodbye! It was great chatting with you. Come back soon!

Notes

• This is a rule-based chatbot, not an AI model
• All patterns can be extended by adding new regex keys
• No external libraries required (uses only Python’s built-in re module)