你的regex应该看起来像这样：

\w{2}-\w{3}\d{5}_\d{10}

您可以查看Regex Demo

解释

pp-gfg76482_8498680983

\w{2}                       #Start with two characters
     -                      #Followed by a -
      \w{3}                 #Followed by 3 characters 
           \d{5}            #Followed by 5 digits
                _           #Followed by _
                 \d{10}     #Followed by 10 digits