Simple string parsing using TSql using the SPLIT and CharIndex functions

Simple string parsing using TSql using the SPLIT and CharIndex functions
Here I need to extract the data AFTER the $ in the input.

--Split out instance Name
SELECT SUBSTRING('MSSQL$SQLDBT01',CHARINDEX('$','MSSQL$SQLDBT01')+1,len('MSSQL$SQLDBT01'))

Here is the output
------------
SQLDBT01