The Open Declaration command allows you to quickly find the declaration of a particular variable or subprogram. In the Fortran editor, click on (or select) an identifier. Then either
This feature is particularly useful when the declaration is in another file. For example, if your program contains a CALL statement which invokes a subroutine imported from a module in another file, invoking Open Declaration on the subroutine name in the CALL statement will open the module in a new editor, and the cursor will be located on the declaration of that subroutine.
Fortran Search is a syntax-aware, multi-file search tool. Unlike textual searches, Fortran Search "understands" Fortran programs. It is used to search for a particular type of declaration (e.g., only modules, or only subroutines), or it can find all of the uses of a particular variable or subroutine. It also allows to you to limit the scope of the search (e.g., it can search every file in the workspace, or just a particular project). In order to use Fortran Search, click on the Search menu and select Fortran...
Wildcards are special symbols used for pattern matching. For more information, click on Help > Help Contents in Eclipse, and navigate to Workbench User Guide > Reference > User interface information > Search.
Regular expressions are an even more advanced pattern matching languages. For more information, click on Help > Help Contents in Eclipse and navigating to Workbench User Guide > Getting started > Basic tutorial > Searching