Regex Tools Hub

A powerful web application for password validation and log file analysis using regular expressions.

Features

1. Password Strength Checker

• Validates password strength against 5 criteria:
  • Minimum 8 characters
  • Uppercase letter
  • Lowercase letter
  • Number
  • Special character
• Visual feedback with strength indicator
• Displays regex patterns used for validation

2. Log File Analyzer

• Extracts and identifies:
  • IPv4 addresses
  • User IDs
  • Email addresses
• Shows line count
• Displays unique matches

Project Structure

├── backend/
│   ├── server.js          # Express server
│   ├── package.json       # Backend dependencies
│   ├── routes/
│   │   └── analyzerRoutes.js
│   └── controllers/
│       └── analyzerController
├── frontend/
│   ├── src/
│   │   ├── App.jsx
│   │   ├── home.jsx
│   │   ├── config.js      # API configuration
│   │   ├── index.css
│   │   ├── password-strength/
│   │   │   ├── password.jsx
│   │   │   └── style.css
│   │   └── log-analyzer/
│   │       ├── logAnalyzer.jsx
│   │       └── style.css
│   ├── package.json
│   ├── vite.config.js
│   └── index.html
└── .env.example           # Environment variables example

Installation

Backend Setup

cd backend
npm install

Frontend Setup

cd frontend
npm install

Running the Application

Start Backend Server

cd backend
npm start
# Server runs on http://localhost:5000

Or on Windows, run the batch file:

cd backend
start-server.bat

Start Frontend Dev Server

cd frontend
npm run dev
# Frontend runs on http://localhost:5173

Building for Production

# Frontend build
cd frontend
npm run build

# Output will be in frontend/dist/

API Endpoints

POST /api/password-check

Analyzes password strength

Request:
{
  "password": "MyPassword123!"
}

Response:
{
  "password": "MyPassword123!",
  "passedRules": 5,
  "totalRules": 5,
  "strength": "Strong",
  "rules": [
    {
      "name": "Minimum 8 characters",
      "description": "At least 8 characters long",
      "regex": "/.{8,}/",
      "passed": true
    },
    ...
  ]
}

POST /api/log-analyzer

Analyzes log content for patterns

Request:
{
  "content": "2024-01-01 user_id=U123 IP=192.168.1.1 email=user@example.com"
}

Response:
{
  "ipv4": ["192.168.1.1"],
  "userIds": ["U123"],
  "emails": ["user@example.com"],
  "lineCount": 1
}

Technologies Used

Backend

• Node.js
• Express.js
• CORS middleware

Frontend

• React 19
• Vite
• React Icons (lucide-react, react-icons)
• CSS3

Configuration

Create a .env file in the root directory:

BACKEND_PORT=5000
VITE_API_URL=http://localhost:5000/api

Or use the default configuration which connects to http://localhost:5000/api

Troubleshooting

Port 5000 Already in Use

If port 5000 is already in use:

1. Find the process: netstat -ano | findstr :5000
2. Kill the process: taskkill /PID <PID> /F
3. Or modify backend/server.js to use a different PORT via environment variable

Frontend Can't Connect to Backend

• Ensure backend is running on port 5000
• Check CORS settings in backend/server.js
• Update frontend/src/config.js if using a different backend port

Module Not Found Errors

Ensure all dependencies are installed:

cd backend && npm install
cd frontend && npm install

Development

Lint Frontend Code

cd frontend
npm run lint

Watch Backend Changes (with nodemon)

cd backend
npm run dev

Author

Built by Kaushik K S with React and powered by Regular Expressions

License

ISC