there are some limitations on ExtractMetadata Selectors and the Selectors we do use e.g. on Click activity.
Some syntax Parts are not supported. In your case do a filtering afterwards with e.g. Filter DataTable, DataTableVar.Select or LINQ on the ExtractedData Datatable
Thanks guys, you give me a good idea, i can combine yours replies and will add a new extract column which contains only values with tag=‘strike’ and i will filter the extract table with this column.