Global Search in VIM

GlobalSearch.vim

function! GlobalSearch()
    let text = escape(input("what do you want to search?: "),  '\\/')
    if text == ""
        echo "" | return
    endif
    let extension = escape(input("Wich extension? (* for all): "), '\\/')
    if extension == ""
        echo "" | return
    endif
    
    let search_command = ':lvim /\V' . text . '/gj ./**/*.' . extension
    try
        execute search_command 
    catch
        echo "Nothing found"
        return
    endtry
    
    lwindow
endfunction

""" mapping the function to leader-shift-f
noremap <leader>F :call GlobalSearch() <CR>