When we want to strip the name from an IS_MSO message, we can use TextStart, and this works fine... as long as the sender's name only contains latin characters. If I use Japanese characters in my name, for instance (and I know this is pretty common for teams and people to use Japanese katakana to stylize text, e.g. ﾁSﾏ for FSR), then TextStart will have a greater value than it should.

Here's an example using "Cyk R", "Cyk ﾏ" (half-width "ma") and "Cyk マ" (full-width "ma") as a nickname and sending a message containing only "test":

buffer[+TextStart] is just me cutting the TextStart first bytes and converting again, for reference, while substr(+TextStart) is how I assume TextStart is supposed to be used, by removing the TextStart first characters from the string.

A single Japanese character caused an offset of 2 characters in TextStart, maybe because ^J is ignored? Also worth noting that full-width Japanese characters cause an additional offset in TextStart, as seen in the 3rd test.

I think this means any codepage change in the player's name will cause TextStart to report erroneous values, and full-width Japanese characters (at the very least) also throw TextStart off. A name like 日本人じゃないけど will cut 11 characters from the message.

With that said, it is possible to use a regular expression to fulfill the same purpose without relying on TextStart, that's what the custom regex line shows in the above tests.