Question

After getting the current word with expand("<cWORD>") and processing the result string, I’m trying to replace the current word with it.

How can I do this?

EDIT Source added. I wrote it in python.

cur_word = vim.eval('expand("<cWORD>")')
parts = cur_word.split('.')
if parts:
    obj, accesses = parts[0], parts[1:]
    result = obj + ''.join("['%s']"%a for a in accesses)
    # how do I replace the current word with result?

Answer 1

In the python interface for Vim, you can execute normal mode command, in your case,

  vim.command("normal BcW%s" % result)

will do the trick.