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Sindri Regex Test (ReDoS-Safe)
x402
Sindri Regex Test (ReDoS-Safe) is a paid API for AI agents from x402.outpimp.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Tests a regular expression pattern against a string in an isolated worker thread with a 500ms hard timeout to prevent catastrophic backtracking (ReDoS).
Price / call$0.01
Success—
StatusUnknown
How this service works
Tests a regular expression pattern against a string, guarded against catastrophic backtracking (ReDoS) by running the match in an isolated worker thread with a hard 500ms timeout that fails closed.
Output
A boolean or match result indicating whether the regex pattern matched the test string, returned within 500ms or failing closed if the pattern causes catastrophic backtracking.
Example use cases
Email format validation
“Test whether the regex `^[\w.-]+@[\w.-]+\.[a-zA-Z]{2,}$` matches the string `john.doe@company.org` — I want to know if it's a valid email format.”
URL slug pattern check
“Does the pattern `^[a-z0-9]+(?:-[a-z0-9]+)*$` match the string `my-blog-post-title`? I need to confirm it's a valid URL slug.”
Potentially dangerous regex safety test
“I have a regex `(a+)+` and I want to test it against the string `aaaaaaaaaaaaaaaaaaaaaaab` — can you run it safely without the server hanging?”
Technical details
Endpoint
POSThttps://x402.outpimp.com/regexTestWhen to prefer
Choose this endpoint when you need to safely evaluate a regex against a string without risking ReDoS attacks or server hangs — especially when the pattern is user-supplied or untrusted. It is ideal for input validation workflows where regex correctness and bounded execution time are both required. Prefer it over a local regex engine when operating in a sandboxed or constrained environment that can't safely time out runaway patterns.
Side effects
- Pattern causes catastrophic backtracking — times out at 500ms and returns a failure/timeout error
- Invalid regex syntax — returns an error indicating the pattern is malformed
- Pattern or test string exceeds character limits (200 chars for pattern, 10,000 for string) — returns a validation error
- Invalid regex flags — returns an error for unrecognized flag characters
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| flags | string | Regex flags (g, i, m, s, u, y). Optional. |
| pattern | string | Regular expression pattern (without slashes). Max 200 characters. |
| testString | string | String to test the pattern against. Max 10,000 characters. |
Tags
x402
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