searching one word containing # with touch *

Hello,
I would like to search the word under my prompt on vim. For this, i can press touch *.
But, if the word i want to search is #foo, as an exemple, vim only searches word foo (without hashtag).
In fact, hashtag is not considered in the word, which is confirmed when i try to go to the next word from # with w.
Do you know how i can search effectively #titi by pressing * on my keyboard?
Thanks.
Mathieu Roux

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