src/vs/workbench/contrib/notebook/browser/contrib/find/findModel.ts/FindModel/_getFindMatches
class FindModel:	private _getFindMatches(): CellFindMatchWithIndex[] | null {
		const val = this._state.searchString;
		const wordSeparators = this._configurationService.inspect<string>('editor.wordSeparators').value;

		const options: INotebookSearchOptions = { regex: this._state.isRegex, wholeWord: this._state.wholeWord, caseSensitive: this._state.matchCase, wordSeparators: wordSeparators };
		if (!val) {
			return null;
		}

		const findMatches = this._notebookEditor.viewModel!.find(val, options).filter(match => match.matches.length > 0);
		return findMatches;
	}