Hi, thanks for the reply.. Actually I am reading that array data from a text file so how can I apply it there?? I think I have to first identify the ID elements in the text through pattern matching, then eliminate all duplicate ID's and their corresponding sequence. but here 1f:a & if:b are duplicate IDs too i.e data after colon (:) isn't considered so they both are considered as same id and duplicates has to be eliminated. Hope I am clear now !! please help me with it.. Thanks in advance

In reply to Re^2: eliminating duplicates with filters by snow28
in thread eliminating duplicates with filters by snow28

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