FA-3116 / Regular expressions / Open access

Only the first record header is found · case 01

Only the first record header is found.

Verified by executionVariant 1 · 4 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The implementation applies an operation whose text or grammar semantics violate this contract: Extract each line containing only an uppercase ASCII name.

VERIFIED REPAIR

Implement the complete stated contract, including the boundary fixtures: Extract each line containing only an uppercase ASCII name.

Unsuccessful approach: The attempted repair handles the primary example but still violates a separate boundary of the same contract.

Case contract

Extract each line containing only an uppercase ASCII name.

Why this case matters

A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct
from urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit
from email.header import decode_header, make_header
from email.utils import getaddresses
from xml.etree import ElementTree as ET
import shlex, string, textwrap

N = 1
observations = []
def solve(x):
    try:
        return re.findall(r'^([A-Z]+)$',x)
    except Exception as exc:
        return {"error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('boundary 1', solve('ABC\nDEF'), ['ABC', 'DEF'])
check('boundary 2', solve('xABC'), [])
check('boundary 3', solve('ABC\n'), ['ABC'])
check('boundary 4', solve(''), [])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
boundary 1	`[]`	`['ABC', 'DEF']`	Failed
boundary 2	`[]`	`[]`	Passed
boundary 3	`['ABC']`	`['ABC']`	Passed
boundary 4	`[]`	`[]`	Passed

SHA-256 / bdbc71876ffe6c9e0a5e60440f488e126dd83966736ae5e811de81fe86696a41

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct
from urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit
from email.header import decode_header, make_header
from email.utils import getaddresses
from xml.etree import ElementTree as ET
import shlex, string, textwrap

N = 1
observations = []
def solve(x):
    try:
        return re.findall(r'[A-Z]+',x)
    except Exception as exc:
        return {"error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('boundary 1', solve('ABC\nDEF'), ['ABC', 'DEF'])
check('boundary 2', solve('xABC'), [])
check('boundary 3', solve('ABC\n'), ['ABC'])
check('boundary 4', solve(''), [])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
boundary 1	`['ABC', 'DEF']`	`['ABC', 'DEF']`	Passed
boundary 2	`['ABC']`	`[]`	Failed
boundary 3	`['ABC']`	`['ABC']`	Passed
boundary 4	`[]`	`[]`	Passed

SHA-256 / 3236d1dbf6f8f84accfab3084fb54fc70a301645580f04a52e7ff625412e4481

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json
import re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct
from urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit
from email.header import decode_header, make_header
from email.utils import getaddresses
from xml.etree import ElementTree as ET
import shlex, string, textwrap

N = 1
observations = []
def solve(x):
    try:
        return re.findall(r'^([A-Z]+)$',x,re.MULTILINE)
    except Exception as exc:
        return {"error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('boundary 1', solve('ABC\nDEF'), ['ABC', 'DEF'])
check('boundary 2', solve('xABC'), [])
check('boundary 3', solve('ABC\n'), ['ABC'])
check('boundary 4', solve(''), [])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
boundary 1	`['ABC', 'DEF']`	`['ABC', 'DEF']`	Passed
boundary 2	`[]`	`[]`	Passed
boundary 3	`['ABC']`	`['ABC']`	Passed
boundary 4	`[]`	`[]`	Passed

SHA-256 / 719729a4f1f5798f4bf3d3a0b8442bb205f03b212ebc7d10948536e8c86f6e51

Verification & scope

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.

Observations recorded using Python 3.12.14 at 2026-09-29T14:37:21.634588+00:00.

Case digest / 8afcc873e82ce93caa4349443425c5d41407e253a713e5c0d009b664242e6af1