If the checkbox Searchable is selected for an expression column, a search icon will appear to the left in the column header. Click the icon and a search box opens. Then type a search criterion (e.g. >100 000). When you hit Enter, all table rows with an expression value matching the search criteria will be selected.
There is a trick I used to use from time to time (love this language =)). Now seriously. You can create a Search Object, size and color it like the header of your straight table. Place it on top of the header and select a field which a search should be. It will be more flexible and you can manage "Text in Search Field" - it will give +1 to userfriendly of your project!
You can click the drop down select and in the dimension when you click the little arrow, right click in the list and you will find Search as one of the options. If you start with '*' and your criteria you can see the desired results.