Tools / Developer utilities
Regex Tester $0.001 / call
Test a regex and get every match with capture groups.
GET /v1/regexRuns a regular expression against text and returns every match with its index, numbered capture groups, and named groups. Deterministic — the reliable way for an agent to apply a regex it can't safely run itself.
Parameters
pattern required | Regular expression source (max 1000 chars) |
text required | Text to match against (max 20000 chars) |
flags | Any of g i m s u y (g is always applied) |
Example
macOS / Linuxcurl -s "https://quartermaster.surewhynot.app/v1/regex?pattern=%5Cb%5Cw%2B%40%5Cw%2B%5C.%5Cw%2B%5Cb&text=ping%20a%40b.com%20and%20c%40d.org"curl.exe -s "https://quartermaster.surewhynot.app/v1/regex?pattern=%5Cb%5Cw%2B%40%5Cw%2B%5C.%5Cw%2B%5Cb&text=ping%20a%40b.com%20and%20c%40d.org"Unpaid, these return 402 Payment Required with the payment details in the header (add -i to see them). curl.exe ships with Windows 10+ and works in cmd and both PowerShell versions. To actually pay, use an x402 client (see Connect) or call it as the MCP tool. Cost: $0.001 per call.
FAQ
Is it safe from catastrophic backtracking?
Input and pattern sizes are capped, and the Workers CPU limit terminates a pathological pattern rather than hanging — you get an error, not a stuck request.
How do I pay for this endpoint?
Call it with no payment and you receive HTTP 402 with machine-readable payment requirements. Attach a USDC payment on Base with any x402 client (for example @x402/fetch) and retry — the whole loop is two requests. This call costs $0.001 in USDC.
Do I need an account or API key?
No. There are no accounts, logins, or API keys anywhere in Quartermaster. Payment is per call over the x402 protocol; your wallet is your identity.
Can I call this as an MCP tool instead?
Yes. Quartermaster is also an MCP server at /mcp, so any MCP client (Claude Code, Claude.ai, Cursor) can mount this tool. See /connect for setup.