{"abstract":"A multiline quoted block stops at a newline.","category":"Regular expressions","checks":4,"contract":"Extract text strictly between BEGIN and END, including newlines; return None for no full match.","contract_signature":"x","evaluation_group":"model-3e3455d31165949e","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-regex-dot-newline","id":"FA-3086","implementations":{"attempt":{"sha256":"5177eff6927aca18f7c14a27a27a54db9233dd0a72112f84956a08703dee8019","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.fullmatch(r'BEGIN(.*?)END',x,re.MULTILINE).group(1) if re.fullmatch(r'BEGIN(.*?)END',x,re.MULTILINE) else None)\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('BEGINa\\nbEND'), 'a\\nb')\ncheck('boundary 2', solve('BEGINEND'), '')\ncheck('boundary 3', solve('BEGINxEND'), 'x')\ncheck('boundary 4', solve('xBEGINaEND'), None)\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":"fea6cded8f4b45d48a41644968a859c5a4d8bd53b4cc8dd3e191817a8e69bd4e","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.fullmatch(r'BEGIN(.*)END',x).group(1) if re.fullmatch(r'BEGIN(.*)END',x) else None)\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('BEGINa\\nbEND'), 'a\\nb')\ncheck('boundary 2', solve('BEGINEND'), '')\ncheck('boundary 3', solve('BEGINxEND'), 'x')\ncheck('boundary 4', solve('xBEGINaEND'), None)\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-dot-newline","generated_at":"2026-09-29T14:37:21.341205+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: Extract text strictly between BEGIN and END, including newlines; return None for no full match.","sha256":"a03771643edffbf0cbddb612e9cd1c650e7c923397cf28670f9e3c52ee0bf0d2","title":"A multiline quoted block stops at a newline · 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":57.18,"exit_code":1,"observations":[{"actual":null,"check":"boundary 1","expected":"a\nb","passed":false},{"actual":"","check":"boundary 2","expected":"","passed":true},{"actual":"x","check":"boundary 3","expected":"x","passed":true},{"actual":null,"check":"boundary 4","expected":null,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": null, \"expected\": \"a\\nb\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"x\", \"expected\": \"x\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": null, \"expected\": null, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":53.821,"exit_code":1,"observations":[{"actual":null,"check":"boundary 1","expected":"a\nb","passed":false},{"actual":"","check":"boundary 2","expected":"","passed":true},{"actual":"x","check":"boundary 3","expected":"x","passed":true},{"actual":null,"check":"boundary 4","expected":null,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": null, \"expected\": \"a\\nb\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"x\", \"expected\": \"x\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": null, \"expected\": null, \"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."}}