[SkyeAv]

feat: add a polars regex comparator option to eq/ne reindex filters

Adds an opt-in regex flag to source.reindex entries so an eq/ne filter can match its comparator as a polars-compatible pattern instead of a literal value. One anchored pattern then drops a whole missing-value family (N/A, n/a, --, not reported) instead of one literal filter per spelling.

Config surface

• New field: Reindex.regex in src/tablassert/models.py, defaulting to false, so a config that never names it validates, dumps, and filters exactly as before.
• Operator gate: regex: true with lt/le/gt/ge is rejected at config time with the new comparison-regex-requires-eq-ne code in src/tablassert/errors.py; ordering comparisons cast the column to Float64, so a pattern there would be silently ignored.
• Pattern gate: the comparator must compile in the polars engine and must not be able to match an empty cell (^, (), .*, x*); both raise regex-bad-pattern, the code NodeEncoding.exclude_regex and Regex.pattern already use. An every-cell pattern under ne would silently drop the whole table. A whitespace-only comparator is rejected for the same reason, while literal ne keeps its empty-comparator idiom (test_reindex_valid).

Testing

• uv run pytest tests/test_models.py -k reindex -n 0 --no-cov -q -> 19 passed (operator mismatch, bad pattern, every-cell pattern parametrized over ^/()/.*/x*, empty and whitespace-only, non-str comparator under regex, default round-trip).
• uv run pyright -> 0 errors.
• uv run ruff check . and uv run ruff format --check . -> clean.

[coderabbitai]

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