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Regex-LE MCP Server

local only

Regex-LE runs on your own machine — the client starts it, so there is no endpoint to ping. 47 installs a week from npm. Last commit 15 Sep 2026.

Extract regular expressions from code, each with a ReDoS safety verdict.

Installs per day peak 253 · avg 12
a month agotoday
47
Installs / week
npm · regex-le-mcp
2
Stars
0 open issues
15 Sep 2026
Last commit
0 releases in 90 days
MIT
License
Rust

What the code does

We read the source, 9 h ago · rules 3dff92dd89df

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

File ships in the package but is absent from the source [пакет] server.js:1
этот файл ставится пользователю, но в репозитории его нет
        r#"(?<![A-Za-z0-9_$.])re\.(?:compile|fullmatch|finditer|findall|match|search|split|subn|sub)[{SPACE}]*\([{SPACE}]*(?:[rR][bB]?"""(?<raw1>[\s\S]*?)"""|[rR][bB]?'''(?<raw2>[\s\S]*?)'''|[rR][bB]?"(?<raw3>{DOUBLE_QUOTED})"|[rR][bB]?'(?<raw4>{SINGLE_QUOTED})'|"""(?<esc1>[\s\S]…
In the project's build, not in the package

Found in continuous integration, deployment or infrastructure files, or in a neighbouring package of the same monorepo. None of this is installed when you add the server: it describes how the project is built and released. We list it because a leaked key in a build pipeline is still a real problem, but it is not something this server does on your machine.

Builds a database query by concatenation .github/workflows/zed-sync.yml:79
      - name: Open or update the bump PR
        env:
          GH_TOKEN: ${{ secrets.ZED_EXTENSIONS_TOKEN }}

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add regex-le -- npx -y regex-le-mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "regex-le": {
      "args": [
        "-y",
        "regex-le-mcp"
      ],
      "command": "npx"
    }
  }
}
~/.codex/config.toml
[mcp_servers.regex-le]
command = "npx"
args = ["-y", "regex-le-mcp"]
.cursor/mcp.json
{
  "mcpServers": {
    "regex-le": {
      "args": [
        "-y",
        "regex-le-mcp"
      ],
      "command": "npx"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "regex-le": {
      "args": [
        "-y",
        "regex-le-mcp"
      ],
      "command": "npx"
    }
  }
}

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Regex-LE — questions

Answers built from our own checks of this server.

Why is there no uptime for Regex-LE?
Regex-LE runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package regex-le-mcp was installed 47 times last week.
How do I connect Regex-LE?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls regex-le-mcp straight from npm; nothing to host, nothing to sign up for.
How many people use Regex-LE?
The npm package regex-le-mcp was installed 47 times in the last week. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Regex-LE open source?
Yes — it is published under the MIT licence, written in Rust and 2 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.