Re: How to switch two strings?

On Dec 1, 11:12 am, Christian Brabandt <cbli...@256bit.org> wrote:
> Hi Peng!
>
> On Di, 01 Dez 2009, Peng Yu wrote:
>
> > I frequently need to switch two strings. For example, if I want to
> > switch 'a' and 'b', I shall use the following three commands. I'm
> > wondering if there is a more convenient way to do so.
>
> > :%s/b/c/g
> > :%s/a/b/g
> > :%s/c/a/g
>
> fu! <SID>SwapWords(...) range
>     if len(a:000)!= 2
>         echomsg "SwapWords has to be called with 2 Arguments!"
>         return
>     elseif (search(a:1 ,'n') == 0 || search(a:2, 'n') == 0)
>         echomsg "not both args found"
>         return
>     endif
>
>     let pat=join(map(copy(a:000), '"\\%(" .v:val. "\\)"'), '\|')
>     :exe a:firstline . ',' . a:lastline . 's/'.pat. '/\=printf("%s",submatch(0)==a:1 ? a:2 : a:1 )/'
> endfu
>
> com! -nargs=+ -range=% Swap :<line1>,<line2>call <SID>SwapWords(<f-args>)
>
> :Swap a b

I try the above command in a file that has on the following line.

a b

But it only replaces 'a' with 'b' but not 'b' with 'a'.

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