Re: How to use an expression as the pattern

I sent the email too soon. I think this question was asked and replied
at

http://groups.google.com/group/vim_use/browse_thread/thread/ab9c297a30bffcf1/75db1eff8dacffaf?hl=en&lnk=gst&q=use+a+variable+as+search+pattern#75db1eff8dacffaf

On Jan 4, 5:44 pm, Karl Cai <karlc...@gmail.com> wrote:
> Hi Vim-users,
>
> Can somebody tell me how to use an expression (e.g., the output of a
> command) as the search pattern? I am using vim 7.0.94
>
> For example:
>
> :let x = system("hostname") # say x is "mycomputer" now. This should work
> :%s/$x/yourcomputer/g        # trying to change all "mycomputer" to
> "yourcomputer". This doesn't work
> Or
> :%s/\=x/yourcomputer/g        # same purpose, but doesn't work either.
>
> In section 9 (9. Compare with Perl patterns) of doc patten.txt it says:
>
> Finally, these constructs are unique to Perl:
> - execution of arbitrary code in the regex:  (?{perl code})
>
> Does this mean that vim can't use an arbitrary expression as the search
> pattern? If so, any known workaround?
>
> Thanks.
>
> -- Karl

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