Function findColumnIndexes

findColumnIndexes(worksheet: Worksheet, query: string | RegExp): number[]
Finds all column indexes that match a name or pattern (case-insensitive).
Parameters
- worksheet: Worksheet
  The ExcelJS worksheet.
- query: string | RegExp
  The column name or pattern to search for.
Returns number[]
An array of 1-based column indexes that match the query.
Example
```
const indexes = findColumnIndexes(worksheet, 'Name');
const allDateColumns = findColumnIndexes(worksheet, /date/i);
```
- Defined in src/excel/excel.tsx:614