Regex test

Run a regular expression against text. Returns up to 100 matches with index and capture groups. Pattern ≤ 200 chars, text ≤ 10KB.

Input

Field	Type	Description
pattern *	string	Regex pattern (JS syntax, max 200 chars)
flags	string	Regex flags, e.g. gi (default g)
text *	string	Text to search (max 10KB)

Example output

{
  "matchCount": 1,
  "matches": [
    {
      "match": "a@b.com",
      "index": 11,
      "groups": [
        "a",
        "b.com"
      ]
    }
  ]
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/regex \
  -H "Content-Type: application/json" \
  -d '{"pattern":"\\b(\\w+)@(\\w+\\.\\w+)\\b","flags":"g","text":"mail me at a@b.com"}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/regex", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "pattern": "\\b(\\w+)@(\\w+\\.\\w+)\\b",
    "flags": "g",
    "text": "mail me at a@b.com"
  }),
});

Related tools