How to change all selected chars to _ in Vim

Posted by Kev on Stack Overflow See other posts from Stack Overflow or by Kev
Published on 2010-06-17T10:30:23Z Indexed on 2010/06/17 10:33 UTC
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vim

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gvim

I try to draw a class diagram using Vim.

I fill the editor window with white-spaces.
Type :match SpellBad /\s/ to highlight all the white-spaces.
Ctrl+Q to select vertical white-spaces.
Ctrl+I to insert Bar(|) and then Esc
...........................
v+l +... + l to select horizontal white-spaces

But I don't know how to change all selected horizontal white-spaces to underscore(_).

I have to hit _ serval times.
When comes to long horizontal line, it's bad.

  ___________             ___________               
 |           |           |           |              
 | BaseClass |/__________|  Client   |              
 |___________|\          |___________|              
      /_\                                           
       |                                            
       |____________________________________        
       |                 |                  |       
  _____|_____       _____|_____        _____|_____  
 |           |     |           |      |           | 
 | SubClass1 |     | SubClass2 |      | SubClass3 | 
 |___________|     |___________|      |¦¦¦¦¦¦¦¦¦¦¦|

I want a quick method to do this.
Select it -> Change it -> Done!
Maybe map F6 to do it.
Thanks!

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