mcp-regex-tools

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

| Tool | Description | |------|-------------| | regex_test | Test a regex pattern against text. Returns all matches with indices, captured groups, and named groups. | | regex_replace | Find and replace using regex with support for capture group references ($1, $2, $&, $<name>). | | regex_extract | Extract all matches of a pattern from text as a structured array. Optionally return only a specific capture group. | | regex_explain | Parse a regex pattern and return a human-readable explanation of each component and flag. | | text_transform | Apply 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. |

npm install
npm run build

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"]
    }
  }
}

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"]
    }
  }
}

regex_test({ pattern: "(\\d{4})-(\\d{2})-(\\d{2})", text: "Today is 2026-03-19 and tomorrow is 2026-03-20" })

regex_replace({ pattern: "(\\w+)\\s(\\w+)", replacement: "$2 $1", text: "hello world" })

regex_extract({ pattern: "[\\