# Regex Explainer (Plain English)

> Regex Explainer (Plain English) is a paid API for AI agents from biz-integral-pull-earrings.trycloudflare.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

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

## Facts

- Endpoint: POST https://biz-integral-pull-earrings.trycloudflare.com/v1/regex-explain?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/regex-explainer-plain-english-1a0ce351
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QlgJLbB1S0vIL8gxDQ8_N

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-1a0ce351 -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 human-readable breakdown of a regex they did not write or do not understand. It is ideal for code review contexts, onboarding, debugging validation logic, or documenting legacy patterns. Prefer it over general-purpose LLMs when you want a dedicated, low-cost, pay-per-call regex explanation with no API key setup required.

## Known failure modes

- Empty or missing regex in message content returns an error or unhelpful response
- Extremely long or malformed patterns may produce incomplete explanations
- LLM may occasionally misinterpret ambiguous or pathological regex edge cases
- Cloudflare tunnel may be unavailable (service is ephemeral/temporary infrastructure)
- Payment of $0.01 USDC required per call; failed payment results in 402 response

## How this service works

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

## Output

A natural language explanation describing what the regex pattern matches, broken down by its components — character classes, quantifiers, groups, anchors, and overall intent — returned as LLM completion text in the choices array.

## 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-1a0ce351/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from biz-integral-pull-earrings.trycloudflare.com](https://www.zero.xyz/host/biz-integral-pull-earrings.trycloudflare.com/llms.txt)