How to set Sublime Text 3 when double clicking a variable to include the $ sign

1. Open Sublime Text 3
2. Click on Preferences->Settings – User
3. Add the following line to the file

   "word_separators": "./\\()\"'-:,.;<>~!@#%^&*|+=[]{}`~?"

   Example:

   {
       "bold_folder_labels": false,
       "color_scheme": "Packages/User/VisualStudio Dark (SL).tmTheme",
       "font_size": 9,
       "ignored_packages":
       [
           "Vintage"
       ],
       "word_separators": "./\\()\"'-:,.;<>~!@#%^&*|+=[]{}`~?"
   }