Add support for DuckDB underscore numeric literals by hamilton · Pull Request #891 · sql-formatter-org/sql-formatter

@hamilton

@hamilton

- Add numberRegex option to TokenizerOptions to allow custom number patterns
- Update Tokenizer to use custom number regex when provided
- Configure DuckDB formatter to support underscore separators in numbers (1_000_000)
- Add test for underscore numeric literals in DuckDB