Regex MCP Server: Install & Setup

Install Regex in Claude Code

Claude Code

claude mcp add regex -- npx -y @mrfentmen/regex-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "regex": {
      "command": "npx",
      "args": [
        "-y",
        "@mrfentmen/regex-mcp"
      ]
    }
  }
}

Test, describe, and validate regular expressions locally. No network and no key.

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

Run: claude mcp add regex -- npx -y @mrfentmen/regex-mcp

pipeworx-io/mcp-reginfo

reginfo MCP — the Unified Agenda of Federal Regulatory and Deregulatory Actions, from reginfo.gov…

ReGenNow/regennexus-mcp

AI-controlled hardware: GPIO, robotics, sensors, cameras, mesh networking for IoT

malkreide/register-mcp

Zefix commercial register with a company-UID join to amtsblattportal.ch (SHAB + cantonal gazettes)

junipertcy/refereekit

Confidential peer review that checks a paper's citations. Set up from the install page first.

pipeworx-io/mcp-regon-pl

Polish business register (REGON / BIR1.1) — resolve any Polish company by NIP, REGON or KRS number…

recordant/recordant

Patent-pending diagnostic + decisions-ledger engine with operator briefs and an MCP console.