[kakkar87d]

$ in patternProperties matches before a trailing newline

generate_pattern rewrites an unescaped $ to \Z so it only matches at the end of the string (ECMA 262 semantics), but generate_pattern_properties compiles the regex unchanged, so Python's $ also matches before a final \n:

>>> v = fastjsonschema.compile({'patternProperties': {'^[a-z]+$': {}}, 'additionalProperties': False})
>>> v({'abc\n': 1})                 # accepted
>>> v = fastjsonschema.compile({'pattern': '^[a-z]+$', 'patternProperties': {'^[a-z]+$': {}}})
>>> v('abc\n')                      # accepted

The second case happens because both keywords store the compiled regex in REGEX_PATTERNS under the original pattern string, so the unfixed patternProperties compile overwrites the fixed one used by pattern. Two tests in tests/test_pattern_properties.py cover both cases; they fail on master and pass with this change, and the rest of the suite passes. CHANGELOG.txt has an entry under UNRELEASED.

[horejsek]

Could you please rebase? 🙏

[kakkar87d]

Rebased on 2.22.3. The only conflict was the changelog, so the entry is now under a new UNRELEASED section.