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io.github.rog0x/regex

Official registry AI and agents

Regex test, explain, replace patterns for AI agents

Source code Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

NPM package @rog0x/mcp-regex-tools
Claude Code 
claude mcp add regex -- npx -y @rog0x/mcp-regex-tools@1.0.1
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "regex": {
            "command": "npx",
            "args": [
                "-y",
                "@rog0x/mcp-regex-tools@1.0.1"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. mcp-regex-tools
  2. Tools
  3. Setup
  4. Usage with Claude Desktop
  5. Usage with Claude Code
  6. Examples
  7. License

mcp-regex-tools

Regex and text processing tools for AI agents via the Model Context Protocol (MCP).

Tools

ToolDescription
regex_testTest a regex pattern against text. Returns all matches with indices, captured groups, and named groups.
regex_replaceFind and replace using regex with support for capture group references ($1, $2, $&, $<name>).
regex_extractExtract all matches of a pattern from text as a structured array. Optionally return only a specific capture group.
regex_explainParse a regex pattern and return a human-readable explanation of each component and flag.
text_transformApply common text transformations: camelCase, snake_case, kebab-case, PascalCase, UPPER, lower, title case, reverse, trim, deduplicate lines, sort lines, remove blank lines, count words/chars/lines. Chain multiple transforms in one call.

Setup

npm install
npm run build

Usage with Claude Desktop

Add this to your Claude Desktop config file:

  • Windows: %APPDATA%\Claude\claude_desktop_config.json
  • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "regex-tools": {
      "command": "node",
      "args": ["D:/products/mcp-servers/mcp-regex-tools/dist/index.js"]
    }
  }
}

Usage with Claude Code

claude mcp add regex-tools node D:/products/mcp-servers/mcp-regex-tools/dist/index.js

Or add to your .mcp.json:

{
  "mcpServers": {
    "regex-tools": {
      "command": "node",
      "args": ["D:/products/mcp-servers/mcp-regex-tools/dist/index.js"]
    }
  }
}

Examples

Test a regex
regex_test({ pattern: "(\\d{4})-(\\d{2})-(\\d{2})", text: "Today is 2026-03-19 and tomorrow is 2026-03-20" })
Replace with capture groups
regex_replace({ pattern: "(\\w+)\\s(\\w+)", replacement: "$2 $1", text: "hello world" })
Extract matches
regex_extract({ pattern: "[\\w.]+@[\\w.]+", text: "Contact us at info@example.com or support@example.com" })
Explain a regex
regex_explain({ pattern: "^(?:https?://)?(?:www\\.)?([\\w-]+)\\.\\w{2,}$", flags: "i" })
Transform text
text_transform({ text: "hello world example", transforms: ["PascalCase"] })
text_transform({ text: "some text\nwith\nlines\nwith\nduplicates\nlines", transforms: ["deduplicate_lines", "sort_lines"] })

License

MIT

Frequently asked questions

What is io.github.rog0x/regex?

Regex test, explain, replace patterns for AI agents

How do I install io.github.rog0x/regex?

It runs on your machine. In Claude Code: claude mcp add regex -- npx -y @rog0x/mcp-regex-tools@1.0.1. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.rog0x/regex need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is io.github.rog0x/regex open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains io.github.rog0x/regex?

It is published by rog0x. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.