Shorter way to call specific plugin function

Question

In the middle of a Vim session, I need to call a particular plugin's function via:

:call UltiSnips#RefreshSnippets()

When from normal mode I type :call UltiS<Tab>, it auto-expands to alphabetically the first offered function:

:call UltiSnips#AddFiletypes(

From here, I have to delete backward one character at a time until the # and then press R<tab> to get autocompletion to have:

:call UltiSnips#RefreshSnippets()

Is there any quicker way to delete backward until the # instead of backspace multiple times? Or else, is there a way to just:

:call UltiS<do something>

to get directly to:

:call UltiSnips#RefreshSnippets()

Answer 1

In command mode you can use: Ctrlw

It delete the previous 'word'

Answer 2

I would probably use Ctrl-f (:help 'cedit') and T#C or similar. Or make a custom command or mapping that calls the function.