Re: vim: how to use back reference to compare strings?

On Sunday, August 11, 2013 8:45:30 AM UTC+12, ping wrote:
>
> what I meant is, how to use these to actually do the compare in a vim ex command line?
> sth like :
>
> :g#\(abc\d\+) bla bla \(abc\d\+\)#if /1 != /2 then echo "found a diff !"

What you want is for submatch() to work in the context of :g. (Where's perl's $1, $2 ... when you want them...) You could fake it using a function and a substitute with the n flag:

func! Diff(a,b)
if a:a != a:b
echo "found a diff!"
endif
endfunc

:g#\(abc\d\+) bla bla \(abc\d\+\)#s//\=Diff(submatch(1),submatch(2))/n

Regards, John Little

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