python - How to remove everything (except certain characters) after the last number in a string -

there learned how remove characters after last number in string; can turn

w = 'w123 o456 t789-- --'

into

w123 o456 t789

now might have strings this:

w = 'w123 o456 (t789)'

in case,

re.sub(r'\d+$', '', w)

would give me

w123 o456 (t789

so have 2 closely related questions:

1) how can modify command re.sub(r'\d+$', '', w) in way characters kept (e.g. parenthesis)?

2) how can modify command re.sub(r'\d+$', '', w) characters removed (e.g. dashes , white spaces)?

edit

@martin bonner's answer gets close e.g.

w='w123 -o456 t789--) --'

the command

 re.sub('[- ]+$', '', w)

gives me w123 -o456 t789--) should rid of remaining dashes.

you may use re.sub in callback replacement pattern.

re.sub(r'\d+$', lambda m: re.sub(r'[^()]+','',m.group(0)), s)

here, match symbols other digits @ end of string, pass value callback, , symbols other ( , ) removed value.

Living