{"abstract":"Replacement counting reports matches instead of actual replacements.","category":"Regular expressions","checks":4,"contract":"Replace at most two digits with X and return [text,replacement_count].","contract_signature":"x","evaluation_group":"model-cd2990785d4be589","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-regex-sub-count-result","id":"FA-3901","implementations":{"attempt":{"sha256":"0beb55f6ec703534d1d88359b18c0f6e2241d3f54cc6794f89fd1fe0ac1e6786","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return [re.sub(r'\\d','X',x,count=2),len(re.findall(r'\\d',x))]\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('123'), ['XX3', 2])\ncheck('boundary 2', solve('a1'), ['aX', 1])\ncheck('boundary 3', solve('none'), ['none', 0])\ncheck('boundary 4', solve('12'), ['XX', 2])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"1fed33b2294bb9f489157d8e437675fe8edd751530cd0d6cea0795a7e2297117","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return [re.sub(r'\\d','X',x),len(re.findall(r'\\d',x))]\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('123'), ['XX3', 2])\ncheck('boundary 2', solve('a1'), ['aX', 1])\ncheck('boundary 3', solve('none'), ['none', 0])\ncheck('boundary 4', solve('12'), ['XX', 2])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":" This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"xp-regex-sub-count-result","generated_at":"2026-09-29T14:37:32.432644+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Replace at most two digits with X and return [text,replacement_count].","sha256":"14493b3a7863204fbc1231651aa16b3b0362aa188ea0d89ae48e5cabbd3e5043","title":"Replacement counting reports matches instead of actual replacements · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":61.254,"exit_code":1,"observations":[{"actual":["XX3",3],"check":"boundary 1","expected":["XX3",2],"passed":false},{"actual":["aX",1],"check":"boundary 2","expected":["aX",1],"passed":true},{"actual":["none",0],"check":"boundary 3","expected":["none",0],"passed":true},{"actual":["XX",2],"check":"boundary 4","expected":["XX",2],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"XX3\", 3], \"expected\": [\"XX3\", 2], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [\"aX\", 1], \"expected\": [\"aX\", 1], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [\"none\", 0], \"expected\": [\"none\", 0], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [\"XX\", 2], \"expected\": [\"XX\", 2], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":52.787,"exit_code":1,"observations":[{"actual":["XXX",3],"check":"boundary 1","expected":["XX3",2],"passed":false},{"actual":["aX",1],"check":"boundary 2","expected":["aX",1],"passed":true},{"actual":["none",0],"check":"boundary 3","expected":["none",0],"passed":true},{"actual":["XX",2],"check":"boundary 4","expected":["XX",2],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"XXX\", 3], \"expected\": [\"XX3\", 2], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [\"aX\", 1], \"expected\": [\"aX\", 1], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [\"none\", 0], \"expected\": [\"none\", 0], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [\"XX\", 2], \"expected\": [\"XX\", 2], \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}