Open Search Dialog Search-> Search... or use Shortcut Ctrl + H.
Containing text: Type the expression for which you wish to do the text search.
Choose if you want Case sensitive, Regular expression or Whole word
File name patterns: In this field, enter all the file name patterns for the files to find or search through for the specified expression.
Scope: Choose the scope of your search. You can either search the whole workspace, pre-defined working sets, previously selected resources or projects enclosing the selected resources.