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

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

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