Find and replace across all buffers in VimEdit

Find and replace across all open buffers:

:bufdo %s/pattern/substituion/gce | update

The same, but across all *.rb files in the current directory hierarchy:

:args **/*.rb
:argdo %s/pattern/substitution/gce | update

Alternatively, use a plug-in like Ferret.

See also

• "Search and replace in all buffers": http://vim.wikia.com/wiki/VimTip1512
• Search and replace in multiple files with a Perl one-liner