Tokenizing a string with HEX characters

[rockets12345]

I am trying to tokenize a string that contains non-displayable characters i.e. HEX. How to split a string based on some HEX characters. e.g.

Here  represents any HEX character which I want to to set as part of Token along with some string as a Token.  can be any HEX character but I just want to split on some of them e.g. in the following sample string I want to split at TEST2

"StartTEST1TEST2TEST3TEST2TEST4TEST5TEST6TEST2TEST7TEST812END"

based on my Tokens the output should look as below:

StartTEST1
TEST3
TEST4TEST5TEST6
TEST7TEST812END

Any idea how to do this. Any help is appreciated.

Thanks