Automatically highlight all same occurrence of same stuff which has been currently marked/selected.

[Hongyi Zhao]

Hi here,

In an Emacs buffer, I want to let it automatically highlight all same
occurrence of some stuff which has been currently marked/selected.

Say, I have the following:

foo ...
.. bar...
baz foo

Then when I select one of the `foo` above, the two `foo`s will be
highlighted automatically. Any tips for achieving this?

Regards,
Zhao
-- 
Assoc. Prof. Hongsheng Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
No. 473, Quannan West Street, Xindu District, Xingtai, Hebei province