从参数中获得特定字符串

=left(
right(right(Fields!ts.Value,4),
len(right(Fields!ts.Value,4))-Instr(right(Fields!ts.Value,4),"[")
),
Instr(
right(right(Fields!ts.Value,4),
len(right(Fields!ts.Value,4))-Instr(right(Fields!ts.Value,4),"[")
),"]")-1
)