Regex Test MCP

Name: Regex Test MCP
Author: MukundaKatta

by MukundaKattaversion 0.1.0i★ 0iRuns on your computer

Registry nameio.github.MukundaKatta/regex-test-mcp

How to install

What it does

Trustworthy JS regex testing. Real offsets, named groups, safe against zero-width loops.

Connects Runs on your computer
Account or key No key needed
Category Developer tools

Install

Pick the AI app you use, then copy the settings.

Passed 3/3 checks · Runs on your computer

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

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

Done

Quit Claude and open it again
Done
Try it
Use Regex Test MCP and tell me what you can do for me, then show me one thing
✓ If Claude says it is using Regex Test MCP or shows a Regex Test MCP tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect Regex Test MCP yet

Regex Test MCP runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect Regex Test MCP

Steps for Claude →Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →Install Node.js on your computer first (one time)
Steps for Cursor →Install Node.js on your computer first (one time)
Steps for VS Code →Install Node.js on your computer first (one time)

B · Others in Developer tools that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Sentry✓ ChatGPT
Compiler Explorer✓ ChatGPT
GitDiagram✓ ChatGPT

Works with Claude Code, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

claude mcp add --scope user regex-test -- npx -y @mukundakatta/regex-test-mcp

Done

Type /mcp in Claude Code
You should see Regex Test MCP listed as connected
Done
Try it
Use Regex Test MCP and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using Regex Test MCP or shows a Regex Test MCP tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use Regex Test MCP and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using Regex Test MCP or shows a Regex Test MCP tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use Regex Test MCP and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using Regex Test MCP or shows a Regex Test MCP tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use Regex Test MCP💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

claude mcp add --scope user regex-test -- npx -y @mukundakatta/regex-test-mcp

Claude Desktop (claude_desktop_config.json)

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

Cursor (~/.cursor/mcp.json)

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

VS Code (mcp.json)

{
  "servers": {
    "regex-test": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@mukundakatta/regex-test-mcp"
      ]
    }
  }
}

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub stars i: 0
Downloads per weeki: 45/wk
Licence i: Apache-2.0
Connection: Runs on your computer
Transport: stdio
Latest versioni: 0.1.0
Categoryi: Developer tools
Published to registryi: May 10, 2026
Code last changedi: Aug 30, 2026
Maker: MukundaKatta
Packages: npm: @mukundakatta/regex-test-mcp
Repo: MukundaKatta/mcp-stack
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 12, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account MukundaKatta, which owns the repo
✓ Pass
Still maintained
Code last changed 2 months ago
✓ Pass
Has a licence
Uses Apache-2.0
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Developer toolsi

More stars than 0% of the other 5786 servers in this category
Published to the registry more recently than 11% of the other 5786 servers in this category
Basic checks equal to or better than 100% of the other 5786 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Regex Test MCP safe?

It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed 2 months ago, and the latest version (0.1.0) reached the registry 6 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: REA, GitHub, Serena MCP: the IDE for your agent

Others in the same category

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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GitHub

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

@mukundakatta/regex-test-mcp

MCP server for trustworthy regex testing. Three tools: test_regex, find_all, replace. All use the actual JS regex engine, so you get exact semantics for lookahead, anchors, named groups, and Unicode escapes.

Why this exists

LLMs reliably hallucinate regex behavior. Common ways they're wrong:

Confidently stating a pattern matches when it doesn't (or vice versa)
Wrong group indices when there are nested capture groups
Forgetting that . excludes newlines without the s flag
Hand-rolling replace results that miss edge cases ($& semantics, named-group syntax)

Routing the actual test through this MCP server avoids all of those.

Tools

Tool	Returns
`test_regex(pattern, text, flags?)`	`{matched, match, start, end, groups, named_groups}` for the first match
`find_all(pattern, text, flags?)`	All non-overlapping matches (always behaves as `g`); zero-width safe
`replace(pattern, text, replacement, flags?)`	New string + `replaced` boolean; supports `$1`, `$` , `$&`

Install — Claude Desktop

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

Same shape for Cursor / Cline / Windsurf / Zed.

License

MIT OR Apache-2.0.

Regex Test MCP

What it does

Install

Install Node.js

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install Node.js

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install Node.js

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Install Node.js

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Developer toolsi

Common questions

Others in the same category

REA

GitHub

Serena MCP: the IDE for your agent

README from the maker

@mukundakatta/regex-test-mcp

Why this exists

Tools

Install — Claude Desktop

License