{"abstract":"A capturing subexpression changes the token result.","category":"Regular expressions","checks":4,"contract":"Return complete signed ASCII integers embedded in text.","evaluation_group":"model-b7a8d484e6499cf7","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-regex-findall-groups","id":"FA-3101","implementations":{"attempt":{"sha256":"0ee61ac37760532ac5005cc19cb9f49688abcb43122fcca30863605c7e0f6231","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.findall(r'[0-9]+',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('a-12 b+3'), ['-12', '+3'])\ncheck('boundary 2', solve('42'), ['42'])\ncheck('boundary 3', solve('none'), [])\ncheck('boundary 4', solve('--1'), ['-1'])\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":"f5b15fbf78cfc90a13550a0ee629455562241ed4619ffe2fef00a3256562edb8","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.findall(r'([+-]?)[0-9]+',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('a-12 b+3'), ['-12', '+3'])\ncheck('boundary 2', solve('42'), ['42'])\ncheck('boundary 3', solve('none'), [])\ncheck('boundary 4', solve('--1'), ['-1'])\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"},"fixed":{"sha256":"8dc057b78d6d49f93a436ec5e3401fb5314b07b8674f0f769a1a72e08bc953b9","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.findall(r'[+-]?[0-9]+',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('a-12 b+3'), ['-12', '+3'])\ncheck('boundary 2', solve('42'), ['42'])\ncheck('boundary 3', solve('none'), [])\ncheck('boundary 4', solve('--1'), ['-1'])\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-findall-groups","generated_at":"2026-09-29T14:37:21.398575+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.","repair":"Implement the complete stated contract, including the boundary fixtures: Return complete signed ASCII integers embedded in text.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Return complete signed ASCII integers embedded in text.","sha256":"eb4cfd03384eaaa1e7983dfdd7673b18d0dcc56e837e67eed79f9ee1c1385703","title":"A capturing subexpression changes the token result · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":53.503,"exit_code":1,"observations":[{"actual":["12","3"],"check":"boundary 1","expected":["-12","+3"],"passed":false},{"actual":["42"],"check":"boundary 2","expected":["42"],"passed":true},{"actual":[],"check":"boundary 3","expected":[],"passed":true},{"actual":["1"],"check":"boundary 4","expected":["-1"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"12\", \"3\"], \"expected\": [\"-12\", \"+3\"], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [\"42\"], \"expected\": [\"42\"], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [\"1\"], \"expected\": [\"-1\"], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":55.425,"exit_code":1,"observations":[{"actual":["-","+"],"check":"boundary 1","expected":["-12","+3"],"passed":false},{"actual":[""],"check":"boundary 2","expected":["42"],"passed":false},{"actual":[],"check":"boundary 3","expected":[],"passed":true},{"actual":["-"],"check":"boundary 4","expected":["-1"],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"-\", \"+\"], \"expected\": [\"-12\", \"+3\"], \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": [\"\"], \"expected\": [\"42\"], \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [\"-\"], \"expected\": [\"-1\"], \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":56.317,"exit_code":0,"observations":[{"actual":["-12","+3"],"check":"boundary 1","expected":["-12","+3"],"passed":true},{"actual":["42"],"check":"boundary 2","expected":["42"],"passed":true},{"actual":[],"check":"boundary 3","expected":[],"passed":true},{"actual":["-1"],"check":"boundary 4","expected":["-1"],"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": [\"-12\", \"+3\"], \"expected\": [\"-12\", \"+3\"], \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": [\"42\"], \"expected\": [\"42\"], \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": [\"-1\"], \"expected\": [\"-1\"], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}