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Aayat AI Regex Explainer
x402
Aayat AI Regex Explainer is a paid API for AI agents from aayatai.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Validates a JavaScript regular expression, explains each token in plain English, flags ReDoS risk, and tests it against up to 20 strings returning match groups.
Price / call$0.001
Success—
StatusUnknown
How this service works
Validate and explain a regular expression (JavaScript flavour): is it valid, what each part means in plain English, whether it risks catastrophic backtracking (ReDoS), and what it matches in up to 20 test strings (with groups). POST {pattern, flags, tests}.
Output
A JSON object containing: whether the pattern is valid, an array of token objects each with a token string and plain-English meaning, a risk field indicating ReDoS danger (null if safe), the number of capturing groups, and a tests array showing for each input string whether it matched, plus all match objects with index, full match text, named groups, and positional capture groups.
Example use cases
Debugging a complex email regex
“I have this regex `^[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}$` — can you explain what each token does in plain English and test it against 'user@example.com', 'bad@', 'test.email+tag@domain.co.uk', and 'no-at-sign', then tell me if it's safe from ReDoS?”
ReDoS vulnerability check before deployment
“Before I ship this regex `(a+)+$` to production, can you check whether it has catastrophic backtracking risk and explain why each part could be dangerous?”
Learning regex capture groups from a pattern
“Can you break down this regex `(\d{4})-(\d{2})-(\d{2})` step by step and show me what groups get captured when I test it against '2024-07-15', '1999-12-31', and 'not-a-date'?”
Technical details
Endpoint
POSThttps://aayatai.com/regex/explain?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need not just pass/fail regex validation but also human-readable token-by-token explanation, security analysis for ReDoS vulnerabilities, and batch testing against multiple sample strings — all in a single call. It is purpose-built for JavaScript regex flavor, so prefer it over generic validators when the runtime target is Node.js or browser JavaScript.
Side effects
- Invalid regex syntax returns valid:false with an error message describing the parse failure
- Pattern exceeding 500 characters is rejected
- More than 20 test strings causes request rejection
- Malformed JSON body returns 400 error
- Payment not provided results in 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| flags | string | JavaScript flags: g i m s u y d v. |
| tests | array | Strings to try it on. |
| pattern | string | The regex source, without slashes, e.g. ^(\d{3})-(\d{4})$ |
Output
Schema · Response
{
"type": "json",
"example": {
"risk": null,
"error": null,
"flags": "",
"parts": [
{
"token": "^",
"meaning": "start of the text (or line with the m flag)"
},
{
"token": "(",
"meaning": "start of capturing group"
},
{
"token": "\\d",
"meaning": "a digit (0-9)"
},
{
"token": "{3}",
"meaning": "repeat the previous item exactly 3 times"
}
],
"tests": [
{
"input": "555-1234",
"matched": true,
"matches": [
{
"index": 0,
"match": "555-1234",
"named": null,
"groups": [
"555",
"1234"
]
}
]
},
{
"input": "5551234",
"matched": false,
"matches": []
}
],
"valid": true,
"groups": 2,
"pattern": "^(\\d{3})-(\\d{4})$"
}
}Tags
x402
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