Regex Test

{
  "engine": "ECMAScript (V8) regular expressions; the text is not stored",
  "flags": "g",
  "match_count": 2,
  "matched": true,
  "matches": [
    {
      "captures": [
        "2026",
        "10",
        "12"
      ],
      "end": 19,
      "index": 9,
      "match": "2026-10-12",
      "named": null
    },
    {
      "captures": [
        "2026",
        "11",
        "03"
      ],
      "end": 39,
      "index": 29,
      "match": "2026-11-03",
      "named": null
    }
  ],
  "pattern": "(\\d{4})-(\\d{2})-(\\d{2})",
  "text_length": 40,
  "truncated": false
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://saylorinnovations.com/api/regex/test?flags=g&pattern=%28%5Cd%7B4%7D%29-%28%5Cd%7B2%7D%29-%28%5Cd%7B2%7D%29&text=Released+2026-10-12%2C+patched+2026-11-03.'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://saylorinnovations.com/api/regex/test?flags=g&pattern=%28%5Cd%7B4%7D%29-%28%5Cd%7B2%7D%29-%28%5Cd%7B2%7D%29&text=Released+2026-10-12%2C+patched+2026-11-03.' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

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

// Pays at most $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fsaylorinnovations.com%2Fapi%2Fregex%2Ftest
const res = await pay("https://saylorinnovations.com/api/regex/test?flags=g&pattern=%28%5Cd%7B4%7D%29-%28%5Cd%7B2%7D%29-%28%5Cd%7B2%7D%29&text=Released+2026-10-12%2C+patched+2026-11-03.");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://saylorinnovations.com/api/regex/test?flags=g&pattern=%28%5Cd%7B4%7D%29-%28%5Cd%7B2%7D%29-%28%5Cd%7B2%7D%29&text=Released+2026-10-12%2C+patched+2026-11-03.")
    print(res.status_code, res.text)