# Strale Regex Explain

> Strale Regex Explain is a paid API for AI agents from api.strale.io, paid per call via x402, $0.054/call, status unknown (last checked 2026-09-14).

Takes a regular expression and optional test strings and returns a plain-English explanation of what the regex matches and how it works

## Facts

- Endpoint: GET https://api.strale.io/x402/v2/regex-explain
- Price: $0.054/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/strale-regex-explain-9013d932
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BgfYJBDTuI5pXqmBj39VT

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 strale-regex-explain-9013d932
```

Example prompt: Can you explain what this regex does in plain English: ^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$ — and test it against the strings '192.168.1.1' and 'not-an-ip'?

## When to prefer this

Choose this endpoint when you need a structured, auditable explanation of a regex pattern — especially in compliance-sensitive or enterprise contexts where the cryptographic audit trail matters. Useful for developers reverse-engineering legacy code, validating regexes before production deployment, or learning regex syntax. The x402 micropayment model means no API key setup is needed.

## Known failure modes

- Invalid or malformed regex pattern returns a parse error
- Missing regex input returns 400 validation error
- Extremely complex or catastrophically backtracking regex may time out
- Payment failure via x402 returns 402 with payment details
- Test strings parameter is optional but must be a string if provided

## How this service works

The trust layer for AI agents — 250+ independently tested data capabilities across 27 countries. Execute capabilities via REST, MCP, A2A, or x402 micropayments. Every call returns an audit record with cryptographic chain hashing.

## Output

A structured JSON response containing a plain-English explanation of the regex pattern, a breakdown of each component (character classes, quantifiers, groups, anchors), descriptions of what the pattern will and won't match, results of any provided test strings against the pattern, and a cryptographically hashed audit record for every call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "test_strings": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/strale-regex-explain-9013d932/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.strale.io](https://www.zero.xyz/host/api.strale.io/llms.txt)