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Help needed generating filenames

Posted By:      Posted Date: August 31, 2010    Points: 0   Category :ASP.Net
I have a sorted array of files saved in the following format of filenames: XXX XXX_XX XXX_XX_XX I want to insert a new file (with a unique filename) between two given filenames (which could be in any of the 3 formats above). For eg., a new file between 401 and 403 could be inserted with name 402 and a new file between 401_01 and 401_02 could be inserted with name 401_01_01. etc The idea is to conform to the sorted list. Is there a way I could generate filenames for the files to be inserted, given the two filenames between which it needs to be inserted? Please help. PS: would it be helpful to use regex?

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