Find toolbar -> “Browse Find (or Replace) Expressions” button,
Select a regular expression or escape sequence from the list, it will insert the selected item into the text box.
=> OK
Filter toolbar -> “Browse Filter Expressions” button,
Select a regular expression or escape sequence from the list, it will Not insert the selected item into the text box.
=> The behavior is different than Find toolbar, Find and Replace dialog box.
After checked the older versions(v14.x), “Browse Filter Expressions” button will insert the selected item.