You can search for a text string in a currently opened file in the editor. Using different options, you can narrow your search process, use regular expressions in your search, and manage your search results.
To find occurences of a text string
Open your file in the editor.
From the main menu, select Edit | Find | Find (Ctrl+F).
In the search field that opens, enter your search string. WebStorm highlights the results of your search in the file.
To see the usages of a symbol in the current file
Place the cursor at this symbol and press Ctrl+F7. WebStorm highlights all the usages of the symbol in the file.
To turn off this highlighting, in the Settings/Preferences dialog (Ctrl+Alt+S), go to Editor | General and clear the Highlight usages of element at caret checkbox.
Manage your search
WebStorm lets you adjust your search process and perform various actions with the displayed search results.
To see the list of previous searches, press Alt+Down in the search field.
To enter a multi-line string, click the icon in the search field for a new line.
To navigate to the previous or to the next occurrence, use the and arrows.
Work with the list of occurrences (Alt+F7) in the Find tool window, where you have other options, for example, to group your results or to open them in a separate window.
To add a selection of the next occurrence or deselect the previous occurrence, click or (Alt+J or Shift+Alt+J).
To quickly replace the target of your search in the whole file, press Ctrl+Shift+Alt+J and type the replacement string.
To narrow your search, select the Words or Match case checkbox on the search pane, or click filter and select a scope for your search.
To quickly select or clear the Regex checkbox, press Alt+X (previously known as Alt+G). Use regular expressions for more challenging searches.
icon in the search field for a new line. 
and 
arrows. 
or 
(Alt+J or Shift+Alt+J). 
and select a scope for your search.