Stan, I have found interesting solution for you.

[jda]

>Hmm, I can understand "-"
>But why it split "_"
>And we can see it NOT split DOT "."
>

ICU doesn't split periods if they are immediately followed by text. I 
assume this is so that decimal numbers (like dollors and cents, such 
as $14.23) aren't split into "14" and "23". This also comes up for 
those who use dot notation in dates: 10.11.2006.

Jon