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caching the limit

 
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I am using oscache of opensymphony to use caching of data. My code problem is as follows:
I store some key and objects in cache, then read a file and do some comparisons, on basis of these, i take the object out of the cache whichever matches and then again add an element to the cache with the Key altered with say a "_" for identification.
After reading of say 10 lines of file, i need to take all the entries of cache with the key starting with "A" as the first character and not having the suffix as "_" in the key.

Is there any funda of groups or something else? Could you provide me some guidelines on this?

Please advise
 
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