Reverse a word in Vim

Question

How can I reverse a word in Vim? Preferably with a regex or normal-mode commands, but other methods are welcome too:

word => drow

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Answer 1

if your version of VIM supports it you can do vw\is or viw\is (put your cursor at the first letter of the word before typing the command)... but I have had a lot of compatibility issues with that. Not sure what has to be compiled in or turned on but this only works sometimes.

EDIT:

\is is:

:let old_reg_a=@a
\ :let old_reg=@"
\ gv"ay :let @a=substitute(@a, '.\(.*\)\@=', '\=@a[strlen(submatch(1))]', 'g') 
\ gvca :let @a=old_reg_a 
\ :let @"=old_reg

Didn't remember where it came from but a google search come this article on vim.wikia.com. Which shows the same thing so I guess that's it.