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24K Labs Regex Tester
x402
24K Labs Regex Tester is a paid API for AI agents from api.24klabs.ai, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Tests a regular expression against input text and returns all matches, capture groups, named groups, and character span positions.
Price / call$0.002
Success—
StatusUnknown
How this service works
Test a regex against text; returns matches, capture and named groups, and spans.
Output
Returns a structured response containing an array of matches, each with the full matched string, an array of positional capture groups, a map of named capture groups (if any), and the start/end character span within the input text. Also includes a total match count.
Example use cases
Extract dates from a log file
“Run the regex `(\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2})` against this log snippet: '[2024-01-10T08:22:11] ERROR: disk full [2024-01-10T08:23:45] WARN: retry' and give me every match with its position in the string.”
Validate capture groups in email parser
“I wrote this email regex: `(?P<user>[\w.+\-]+)@(?P<domain>[\w\-]+)\.(?P<tld>[a-z]{2,})` — test it against 'Contact us at support@example.co.uk or sales@company.com' and show me the named groups for each match.”
Debug pattern for invoice number extraction
“Can you test the pattern `INV-(?P<year>\d{4})-(?P<seq>\d{5})` against the text 'Invoices: INV-2023-00123, INV-2024-00456, REF-2024-00789' and tell me which strings matched, what the capture groups contain, and the exact character spans?”
Technical details
Endpoint
POSThttps://api.24klabs.ai/api/v1/regex-testWhen to prefer
Choose this endpoint when you need to programmatically test or debug a regex pattern against text and require structured output including capture groups, named groups, and span positions — especially useful in agentic workflows where downstream steps need to consume match data. Prefer it over running regex locally when you need a deterministic remote result with span metadata or when building no-code/low-code automation that lacks a native regex engine.
Side effects
- Invalid regex syntax returns an error describing the pattern fault
- Empty input text returns zero matches
- Catastrophic backtracking on complex patterns may time out
- Flags not supported by the engine return an error
- Pattern with no matches returns an empty matches array
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | |
| flags | string | |
| pattern | string |
Output
Schema · Response
{
"type": "json",
"example": {
"match_count": 2
}
}Tags
x402
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