MCP server

Regex Explainer

com.gumballtools/regex-explainer

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Explain a regex in plain English and detect catastrophic backtracking risk.

Working at last checkVerified publisher: gumballtools.comAbout 542 tokens per request once connected1 tools

https://regex-explainer.gumballtools.com/api/mcp

At a glance

Type: MCP server
Publisher: gumballtools.com (verified by the MCP Registry)
Status: Working at last check
Tools: 1
Token cost: About 542 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http regex-explainer https://regex-explainer.gumballtools.com/api/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.regex-explainer]
url = "https://regex-explainer.gumballtools.com/api/mcp"

Gemini CLI

{"mcpServers":{"regex-explainer":{"httpUrl":"https://regex-explainer.gumballtools.com/api/mcp"}}}

Cursor

{"mcpServers":{"regex-explainer":{"url":"https://regex-explainer.gumballtools.com/api/mcp"}}}

VS Code

{"servers":{"regex-explainer":{"type":"http","url":"https://regex-explainer.gumballtools.com/api/mcp"}}}

Antigravity

agy mcp add regex-explainer https://regex-explainer.gumballtools.com/api/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"regex-explainer","server_url":"https://regex-explainer.gumballtools.com/api/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"regex-explainer","server_url":"https://regex-explainer.gumballtools.com/api/mcp"}

explain_regex ~542 tokens
Explain a regular expression in plain English and detect the failure modes that make patterns dangerous rather than merely wrong. Use this whenever a regex needs to be read, reviewed, or verified — and ALWAYS before putting a pattern somewhere it will run against untrusted input. The critical check

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