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Toolbelt402 Regex Tester
x402
Toolbelt402 Regex Tester is a paid API for AI agents from toolbelt402.tpoborne.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Tests and debugs a regular expression against up to 50 sample strings, returning match results, capture groups, named groups, and pass/fail evaluations against expectations.
Price / call$0.002
Success—
StatusUnknown
How this service works
Test and debug a regular expression against up to 50 sample strings — real match results, capture groups, named groups, and pass/fail against expectations. Deterministic regex testing.
Output
Returns per-test-case results including whether the regex matched each input string, the full match text, indexed capture groups, named capture groups, match positions, and a pass/fail verdict compared against the expected outcome. Typically covers up to 50 test cases per call.
Example use cases
Validate email regex before shipping
“I've written this regex for email validation: `^[\w.+-]+@[\w-]+\.[a-z]{2,}$` with the `i` flag. Can you test it against 'user@example.com' (should match), 'bad@' (should not match), and 'another.user+tag@sub.domain.org' (should match), and show me if the capture groups look right?”
Debug named capture groups in log parser
“I'm trying to parse log lines with this regex: `(?P<level>ERROR|WARN|INFO)\s+(?P<msg>.+)` — can you run it against 'ERROR Something went wrong' (expect match), 'INFO Server started' (expect match), and 'DEBUG this should fail' (expect no match), and show me the named groups?”
Confirm regex flags behave as expected
“Test my case-insensitive pattern `^hello\s+world$` with the `im` flags against 'Hello World' (should match), 'HELLO WORLD' (should match), and 'goodbye world' (should not match) — I want to see the actual match results and whether each case passes.”
Technical details
Endpoint
POSThttps://toolbelt402.tpoborne.workers.dev/regex/testWhen to prefer
Choose this endpoint when you need deterministic, server-side regex validation with structured pass/fail reporting across multiple test strings — especially when you want capture group and named group extraction confirmed, or when building/debugging regex patterns programmatically without relying on a local execution environment.
Side effects
- Invalid regex pattern syntax returns an error describing the parse failure
- Exceeding 50 test cases may result in truncation or rejection
- Unsupported or conflicting regex flags return a flag validation error
- Missing required fields (pattern or cases) result in a 400-level error
- Regex with catastrophic backtracking may time out
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| cases | array | |
| flags | string | Any of g i m s u y v d |
| pattern | string |
Tags
x402
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