Debug-Regex-Global-State-V2

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 diagnosis, fix, tests. A validator reuses a global regular expression with test(), causing alternating true and false results for the same input. Identify the bug and fix.

{
  "metrics": {
    "repro": {
      "checks": [
        {
          "contains": [
            "same input"
          ]
        },
        {
          "contains": [
            "alternating"
          ]
        },
        {
          "contains": [
            "global"
          ]
        },
        {
          "contains": [
            "test"
          ]
        }
      ]
    },
    "hidden": {
      "checks": [
        {
          "contains": [
            "remove g"
          ]
        },
        {
          "contains": [
            "lastIndex"
          ]
        },
        {
          "contains": [
            "new RegExp"
          ]
        }
      ]
    },
    "diagnose": {
      "checks": [
        {
          "contains": [
            "regex"
          ]
        },
        {
          "contains": [
            "state"
          ]
        },
        {
          "contains": [
            "validator"
          ]
        }
      ]
    }
  }
}