Is it possible to do something like:

:g/\(\w+\) .*/python foo(\1)

and then have all the matching lines changed to the output of the
python foo() function?

For example,

+--------------------------------
we are on line one
we are on line two
+--------------------------------

and given

def foo(x): return len(x)

we get

2 are on line one
2 are on line two

since the matching part ("we") has two letters.

I hope that made some sense.

The main thing is to somehow pull out the matching part in the \(\w+\)
and feed it into some other Python function.


Thanks in advance.
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