{"abstract":"A literal search term executes regex syntax.","category":"Regular expressions","checks":4,"contract":"Return whether the exact needle x[0] appears anywhere in haystack x[1].","evaluation_group":"model-743b1d1d6e33c87c","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-regex-literal-pattern","id":"FA-3076","implementations":{"attempt":{"sha256":"01ed52b995a04aeb41c527d2bd5af86da83c87e90521277e2a46ab9347713a55","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 bool(re.match(re.escape(x[0]),x[1]))\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.b', 'axb']), False)\ncheck('boundary 2', solve(['a.b', 'xxa.b']), True)\ncheck('boundary 3', solve(['*', 'x*']), True)\ncheck('boundary 4', solve(['z', 'abc']), False)\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":"0042d715eff251b3108ed31968903ee97f331fe0f3bb68b085ed068806912fcf","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 bool(re.search(x[0],x[1]))\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.b', 'axb']), False)\ncheck('boundary 2', solve(['a.b', 'xxa.b']), True)\ncheck('boundary 3', solve(['*', 'x*']), True)\ncheck('boundary 4', solve(['z', 'abc']), False)\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":"42a802fd76a6449d5523ff9ffcb903e6eeaa2da81be1e1538cc6eeae30b2470a","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 bool(re.search(re.escape(x[0]),x[1]))\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.b', 'axb']), False)\ncheck('boundary 2', solve(['a.b', 'xxa.b']), True)\ncheck('boundary 3', solve(['*', 'x*']), True)\ncheck('boundary 4', solve(['z', 'abc']), False)\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-literal-pattern","generated_at":"2026-09-29T14:37:20.948658+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 whether the exact needle x[0] appears anywhere in haystack x[1].","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Return whether the exact needle x[0] appears anywhere in haystack x[1].","sha256":"47804e194b949b3f4b5a6923d986835229fe5a83e49d7ce10755062d9392768c","title":"A literal search term executes regex syntax · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":61.325,"exit_code":1,"observations":[{"actual":false,"check":"boundary 1","expected":false,"passed":true},{"actual":false,"check":"boundary 2","expected":true,"passed":false},{"actual":false,"check":"boundary 3","expected":true,"passed":false},{"actual":false,"check":"boundary 4","expected":false,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":63.839,"exit_code":1,"observations":[{"actual":true,"check":"boundary 1","expected":false,"passed":false},{"actual":true,"check":"boundary 2","expected":true,"passed":true},{"actual":{"error":"error"},"check":"boundary 3","expected":true,"passed":false},{"actual":false,"check":"boundary 4","expected":false,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": {\"error\": \"error\"}, \"expected\": true, \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":52.001,"exit_code":0,"observations":[{"actual":false,"check":"boundary 1","expected":false,"passed":true},{"actual":true,"check":"boundary 2","expected":true,"passed":true},{"actual":true,"check":"boundary 3","expected":true,"passed":true},{"actual":false,"check":"boundary 4","expected":false,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}