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Regex · Generate

Guest listing — SiteCheck. A regular expression from a description, with examples that must match and examples that must not. The pattern is returned only when every example passes when tested in the service (one retry with the failures). Patterns with nested quantifiers are refused to avoid catastrophic backtracking. Examples are up to 10 strings of 300 characters each.

POST https://api.sitecheck-api.workers.dev/api/regex/generate

0.002 USDC on Base · payTo 0xb8491F953e6860D3b5840b73c60883Ff099ceAfA

Status: verified · payable

Settlement: direct to the seller's payTo — 0% HIVE402 take

Payment routes

{
  "checkedAt": "2026-10-15T18:21:15.842Z",
  "explanation": "The pattern ^\\d{5}$ matches a string that starts with and ends with exactly 5 digits, ensuring a five-digit postal code.",
  "flags": "",
  "note": "Tested only against the examples you gave; it may still match or miss other inputs.",
  "pattern": "^\\d{5}$",
  "tests": {
    "matches": 2,
    "nonMatches": 3,
    "passed": true
  }
}