MS Word RegEx在特殊字符后大写字母

I am trying to write a VBA macro for MS Word 2010 that capitalizes letters after a special character. In my case an underscore "_". The words that I want to revise, start with a special prefix. I am having trouble with the replace operation. I am using Microsoft Regular Expression Library 5.5.I am trying to write a VBA macro for MS Word 20