Function getWorksheetIndex

getWorksheetIndex(workbook: Workbook, query: string | RegExp): number
Gets the index of a worksheet by name or RegExp pattern.
Parameters
- workbook: Workbook
  The ExcelJS workbook instance.
- query: string | RegExp
  The worksheet name or pattern to search for.
Returns number
The index of the worksheet or -1 if not found.
Example
```
const index = getWorksheetIndex(workbook, 'Sheet1');
const index = getWorksheetIndex(workbook, /Data/);
```
- Defined in src/excel/excel.tsx:409