Question on excel formula and functions for individual cell attributes

Hello,

Can anyone help me with this excel question.

Is there an excel formula that I can use that would help me count a specific attribute within an individual cell?

For example:

a_b

a_b_c

a_b_c_d_e

I would like to know if there is a fomula that would help to identify and count the number of underscores in each cell. the first  example would be a count of 1 underscore. Followed by 2 underscores and so on.

Can anyone provide any guidance or advice?  I really don't want to have to manually count it.

Thank you so much.

Camille