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ECMAScript Regex Backtracking Risk Scanner
x402
ECMAScript Regex Backtracking Risk Scanner is a paid API for AI agents from rooke-token-risk-pilot.rookepoole.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).
Analyzes a regular expression pattern for catastrophic backtracking (ReDoS) risk using static heuristics and returns a risk verdict, score, and flagged complexity concerns.
Price / call$0.05
Success—
StatusUnknown
How this service works
Public static preview plus paid token controls, risk consensus, AI security, webhook reliability, developer security, schedule risk, decision analysis, API release compatibility, accounts-payable reconciliation, e-commerce return eligibility, SaaS subscription-proration, sales-commission reconciliation, parcel-charge reconciliation, SLA service-credit reconciliation, advertising spend-and-fee audit, contract-renewal audit, workforce timecard reconciliation, hotel booking-commission reconciliation, and warehouse cycle-count adjustment reconciliation products for autonomous agents.
Output
Returns a JSON object with: a verdict string (e.g. HIGH_BACKTRACKING_RISK), a numeric risk score, an array of risk flags (e.g. QUANTIFIED_OVERLAPPING_ALTERNATION), a complexity concern label (e.g. POTENTIALLY_EXPONENTIAL), evidence gaps noting limitations of static analysis, a claim boundary object clarifying what was and wasn't tested, a report hash for auditability, and the schema version identifier.
Example use cases
Production regex safety gate
“Before we deploy this email validation regex `^([a-zA-Z0-9_\.\-]+)@([a-zA-Z0-9\-]+\.)+[a-zA-Z]{2,}$` to production, can you scan it for backtracking risk with the 'i' flag and inputs up to 500,000 characters?”
CI pipeline regex audit
“I need to check our URL-matching regex `^(https?:\/\/)?(www\.)?([a-zA-Z0-9]+\.)+[a-zA-Z]{2,}(\/.*)*$` for ReDoS vulnerabilities — run it with no flags, max input of 10,000 characters, and tell me the risk score.”
Untrusted user-submitted pattern review
“A user just submitted this regex pattern `(.*a){20}` for our search feature — can you assess its backtracking risk with the 'g' flag and worst-case inputs up to 1,000,000 characters before I allow it?”
Technical details
Endpoint
POSThttps://rooke-token-risk-pilot.rookepoole.workers.dev/v1/x402/regex-backtracking-riskWhen to prefer
Choose this endpoint when you need a fast, stateless, per-pattern ReDoS risk signal without setting up your own static analysis toolchain. It is especially useful in CI/CD pipelines, agent workflows that accept user-submitted patterns, or pre-deployment audits. It is not a substitute for runtime fuzzing or formal complexity proofs, as the claim boundary explicitly flags its heuristic limitations.
Side effects
- Pattern exceeds 4096-character limit — returns validation error
- Invalid flags outside [dgimsuvy] — schema rejects request
- minLength violation if pattern is empty string — returns 400
- Static heuristics may produce false positives or miss complex runtime behavior (noted in evidenceGaps)
- No runtime benchmark performed — deterministic field is true but runtimeBenchmarked is false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| flags | string | |
| pattern | string | |
| expectedMaximumInputCharacters | integer |
Output
Schema · Response
{
"type": "json",
"example": {
"verdict": "HIGH_BACKTRACKING_RISK",
"findings": [],
"riskFlags": [
"QUANTIFIED_OVERLAPPING_ALTERNATION"
],
"riskScore": 50,
"reportHash": "sha256-hex",
"evidenceGaps": [
"STATIC_HEURISTICS_ARE_NOT_A_COMPLETE_COMPLEXITY_PROOF"
],
"claimBoundary": {
"deterministic": true,
"runtimeBenchmarked": false,
"attackerInputGenerated": false,
"definitiveSafetyVerdict": false,
"submittedPatternExecuted": false
},
"schemaVersion": "ECMASCRIPT_REGEX_BACKTRACKING_RISK_SCAN_V1",
"complexityConcern": "POTENTIALLY_EXPONENTIAL"
}
}Tags
x402
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