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regex-toolkit-api

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Regex testing, explanation, and generation REST API + MCP server. No external APIs required.

Quick Start

npm install
npm start          # REST API on http://localhost:4200
npm run mcp        # MCP server (stdin/stdout)

REST API Endpoints

Method	Endpoint	Description
GET	/	Health check / API info
POST	/api/v1/test	Test regex against text (matches, groups, indices)
POST	/api/v1/replace	Replace using regex
POST	/api/v1/split	Split text with regex
POST	/api/v1/validate	Validate regex syntax
GET	/api/v1/patterns	List common regex patterns
GET	/api/v1/patterns/:name	Get specific pattern (email, url, phone, ipv4, etc.)
POST	/api/v1/explain	Explain regex in plain English
POST	/api/v1/escape	Escape special regex characters
POST	/api/v1/benchmark	Benchmark regex performance

Examples

Test a regex

curl -X POST http://localhost:4200/api/v1/test \
  -H 'Content-Type: application/json' \
  -d '{"pattern": "(\\d+)", "text": "abc 123 def 456", "flags": "g"}'

Explain a regex

curl -X POST http://localhost:4200/api/v1/explain \
  -H 'Content-Type: application/json' \
  -d '{"pattern": "^[a-z]+\\d{2,4}$", "flags": "i"}'

Get a common pattern

curl http://localhost:4200/api/v1/patterns/email

Common Patterns Library

email, url, phone, ipv4, ipv6, date_iso, date_us, credit_card, hex_color, uuid, mac_address, slug, semver, jwt, html_tag, username, strong_password

MCP Server

Add to your Claude Desktop config:

{
  "mcpServers": {
    "regex-toolkit": {
      "command": "node",
      "args": ["/path/to/regex-toolkit-api/src/mcp-server.js"]
    }
  }
}

MCP Tools

• regex_test — Test regex with full match details
• regex_replace — Regex replace
• regex_split — Split by regex
• regex_validate — Validate syntax
• regex_explain — Plain English explanation
• regex_escape — Escape special characters
• regex_patterns — Common patterns library
• regex_benchmark — Performance benchmark

Docker

docker build -t regex-toolkit-api .
docker run -p 4200:4200 regex-toolkit-api

License

MIT

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