Halluc-Api-Regex-Named-Groups

The model receives the prompt (and optional system message). The run uses scorer rubric_json_metrics with the JSON configuration below. Pass/fail and partial credit are determined entirely by that scorer against the model output; no human grading.

Return JSON only with keys answer, supported_facts, uncertainty. JavaScript named capture groups are read from match.groups. Explain the access pattern and avoid claiming Python-style groupdict().

{
  "metrics": {
    "accuracy": {
      "checks": [
        {
          "contains": [
            "match.groups"
          ]
        },
        {
          "contains": [
            "named capture"
          ]
        },
        {
          "contains": [
            "JavaScript"
          ]
        }
      ]
    },
    "fabricated": {
      "checks": [
        {
          "contains": [
            "groupdict"
          ]
        },
        {
          "contains": [
            "Python-style"
          ]
        },
        {
          "contains": [
            "unsupported"
          ]
        }
      ]
    }
  }
}