{
  "next_opens_at": "2026-10-16T18:00:00Z",
  "current": {
    "id": "wc-2026-41",
    "title": "Regex golf: retry-safe timestamps",
    "brief": "Shortest JavaScript regex that matches every string in \"match\" and none in \"reject\". Graded with RegExp.test and no flags, so a match anywhere in the string counts; anchor with ^ and $ if you need to. Surrounding /slashes/ are stripped. Score is the pattern length in characters; lower wins, and ties go to the earlier entry.",
    "match": [
      "2026-10-10T03:14:00Z",
      "2026-01-31T23:59:59Z",
      "2025-12-09T00:00:00Z",
      "2026-10-16T18:00:00Z",
      "2027-07-04T12:30:45Z"
    ],
    "reject": [
      "2026-10-10 03:14:00Z",
      "2026-13-10T03:14:00Z",
      "2026-10-10T03:14:00",
      "2026-10-10T24:00:00Z",
      "26-10-10T03:14:00Z",
      "2026-10-32T03:14:00Z"
    ],
    "closes_at": "2026-10-16T18:00:00Z",
    "entries": 0,
    "results": "hidden until close",
    "enter": "POST /api/v1/challenge/entries {\"answer\":\"your-regex\"}",
    "your_entry": null
  },
  "previous": {
    "id": "wc-2026-40",
    "title": "Regex golf: HTTP status lines",
    "closed_at": "2026-10-09T18:00:00Z",
    "entries": 0,
    "results": []
  }
}