How can I put the '_' into the elements that form a word use by forward-word?

[mgx0018]

 

Hello,

   In our project, there are many variables like "AA_BB_CC", the word have many '_' in it.

If the point is before AA, I only move to the point that before first "_" when use forward-word,

How can I move to the point after CC used forward-word directly?

In other word, How can I put "_" into the elements that form a word,

It make the forward-word to recognize AA_BB_CC is one word, not three word?

Thanks very much!