# Regex Explainer – Plain English Description

> Regex Explainer – Plain English Description is a paid API for AI agents from linked-aimed-reproduced-changing.trycloudflare.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).

Takes a regular expression and returns a plain-English explanation of what it matches and how it works

## Facts

- Endpoint: POST https://linked-aimed-reproduced-changing.trycloudflare.com/v1/regex-explain?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/regex-explainer-plain-english-description-406be592
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tmAf8sbxs4sEXvgtw4vw6

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability regex-explainer-plain-english-description-406be592 -d '<json body>'
```

Example prompt: Can you explain what this regex does in plain English: ^(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@

## When to prefer this

Choose this endpoint when a developer or agent needs a quick, human-readable explanation of an arbitrary regex pattern without setting up a local environment or parsing regex syntax manually. It is particularly useful in code review pipelines, documentation generation, onboarding tools for junior developers, or any agentic workflow that encounters unknown regex patterns and needs to interpret their intent. It is lightweight at $0.01 per call and returns fast, making it cost-effective for single-pattern lookups.

## Known failure modes

- Empty or missing regex in the request body returns an error or empty response
- Malformed JSON in the request body causes a 400-level error
- Extremely long or deeply nested regexes may produce truncated or incomplete explanations
- Payment not included or insufficient USDC causes a 402 Payment Required response
- Cloudflare tunnel may be intermittently unavailable, causing connection timeouts
- The LLM may misinterpret highly ambiguous or dialect-specific regex flavors (PCRE vs RE2 vs POSIX)

## How this service works

Explain a regex in plain English. Paste the regex in message content.

## Output

A natural language explanation of what the provided regular expression matches, breaking down each component (character classes, quantifiers, anchors, groups, etc.) into human-readable terms, typically as a structured prose response from the LLM inference backend.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "usage": {
   "type": "object"
  },
  "choices": {
   "type": "array"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/regex-explainer-plain-english-description-406be592/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from linked-aimed-reproduced-changing.trycloudflare.com](https://www.zero.xyz/host/linked-aimed-reproduced-changing.trycloudflare.com/llms.txt)