There is a java table in my application which has 1 column & 5 rows. Contents of rows are as below. These contents are arranged in descending order

172-18-zfs   
MKTLAB  
NFSVOL                                                                
datastore1                       
datastore1(1)  

after clicking on column header it get sort in asceding order & order is like this

datastore1(1)  
datastore1   
NFSVOL  
MKTLAB  
172-18-zfs

Through QTP i want to check whether this sortig is correct or not. I have used sort() method of dictionary but it doesnt give expected result. It just sort according to alphabatical order.
In expected sorting order 1st priority should be to small letter then to capital letter then to number.