Using back-references in 'range'

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I have a program with a number of constructs like this:-

for subscriptI to count someThing do
something( subscriptI ) := ""
repeat
@...
begin
for subscriptJ to count someThingElse do
someThingElse( subscriptJ ) := ""
repeat
end

And I ant to replace all the different subscripts with a generic 'i' or (for nested loops) 'j'

What I thought of was to use a global operation limited to the 'for' and the matching 'repeat', and what I tried was this:-

:/^\(\s\+\)for\s\+\(\a\k*\)\s\+to.*/,/^\1repeat/g/\2/s/\2/i/g

Only I fell at the first hurdle because it fails to find the matching repeat pattern.

Is this possible? Or am I missing an easier way to do this?

Regards, Andy


--
Andrew Long
andrew dot long at mac dot com