Sindri Regex Test (ReDoS-Safe)

x402

Sindri Regex Test (ReDoS-Safe) is a paid API for AI agents from ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Tests a regular expression pattern against a string with built-in protection against catastrophic backtracking (ReDoS) via a 500ms isolated worker thread timeout.

Price / call$0.01

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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

Returns a JSON object indicating whether the test string matched the given regex pattern, along with any match details. If the regex causes catastrophic backtracking and exceeds the 500ms timeout, the call fails closed (returns a failure/timeout result rather than hanging).

Example use cases

Validate user input format safely

“Check if the string '2024-07-15' matches the regex pattern `^\d{4}-\d{2}-\d{2}$` — I want to make sure user-submitted dates follow ISO format without risking a regex denial-of-service.”

Debug a complex regex pattern

“Test whether the pattern `(a+)+$` with no flags matches the string 'aaaaaaaaab' — I'm trying to understand why this regex is slow and want to see if it times out safely.”

Filter log lines by pattern

“Does the string 'ERROR 2024-07-15 disk quota exceeded on /var/log' match the regex `^ERROR.*disk quota` with the `i` flag? I want to check this pattern before using it in my log parser.”

Technical details

Endpoint

POSThttps://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/regexTest?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need to safely evaluate a regular expression against a string and cannot risk a runaway ReDoS attack hanging your pipeline. Ideal for user-supplied or untrusted regex patterns, or when validating input in a production agent workflow where reliability is critical. Prefer over a bare regex eval when the pattern complexity is unknown or could be malicious.

Side effects

Pattern causes ReDoS — 500ms timeout triggers and call fails closed
Pattern exceeds 200 character limit — returns validation error
testString exceeds 10,000 character limit — returns validation error
Invalid regex syntax — returns parse error
Invalid flags provided — returns error
Network or Lambda cold-start latency causing unexpected delay

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.

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