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x402-tools Regex From Examples
x402
x402-tools Regex From Examples is a paid API for AI agents from x402.nichospt.net, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).
Generates a regular expression that matches given example strings and optionally rejects specified strings, supporting JS, PCRE, and Python flavors.
Price / call$0.005
Success—
StatusUnknown
How this service works
Pay-per-call utility APIs for AI agents, settled in USDC via the x402 protocol.
Output
Returns a JSON object containing the inferred regex pattern string, any flags needed, a human-readable explanation of what the pattern matches, and a validation report showing whether all positive examples matched and all negative examples were rejected, plus any failures.
Example use cases
Example prompt
“Generate a JavaScript regex from these examples that must match: 'user@example.com', 'hello+tag@mail.co.uk', 'name.last@sub.domain.org' — and must NOT match: 'notanemail', '@nodomain.com', 'missing@'.”
Technical details
Endpoint
POSThttps://x402.nichospt.net/regex-from-examples?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically infer a regex from concrete string examples rather than writing one by hand, especially when the pattern logic is non-obvious or you want automatic validation. Ideal for agents building dynamic input validators, data pipelines, or form field matchers at runtime. Choose the flavor parameter to match your runtime (js for browsers/Node, python for Python scripts, pcre for PHP/Nginx/grep).
Side effects
- No valid regex can satisfy both positive and negative examples simultaneously — returns error or partial match
- Too few examples provided to infer a meaningful pattern — may return overly broad or literal regex
- Contradictory examples (a string in both match and should_not_match) — validation failures reported
- Unsupported regex flavor requested — returns 400 or defaults
- Payment not settled via x402 — 402 Payment Required response blocks the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| flavor | string | |
| examples | array | Strings the regex MUST match |
| should_not_match | array | Strings the regex MUST NOT match (optional) |
Output
Schema · Response
{
"type": "json",
"example": {
"flags": "",
"pattern": "^[\\w.+-]+@[\\w-]+(?:\\.[\\w-]+)+$",
"validation": {
"failures": [],
"matchesAll": true,
"rejectsAll": true
},
"explanation": "Matches simple email addresses."
}
}Tags
x402
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