Karl Cai wrote:
> 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

A slightly more robust way involves escaping the variable with 
escape(), something like

   :exec ':%s/'.escape(myvar, '/.*^$[~\\').'/replacement/g'

You can also do this something like

   :let @/=myvar
   :%s//replacement/g

which sets the "previous search" register to your contents (it 
will accept things like regexps, without needing to escape the 
"/" character), and then searches for it, because an empty search 
reuses the last search pattern.

Additionally, you can alo use control+R followed by equals to 
enter an arbitrary expression to be evaluated, such as


   :%s/<c-r>=42*2<cr>/replacement/g

to make your command

   :%s/84/replacement/g

Just a few suggestions to try.

-tim


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