Search similar entries

Hi,

I need to know, how to search similar entries in list of numeric entries.

eg:
Suppose I have numeric entries of 6 digits each having numbers among 1,2,3&4
Like: 123432, 213232, 321232, 413232...

In the list of numbers we will have many random numbers having 5 out 6 digits same and also in same sequence.
Like: 123123, 223123, 323123, 423123 (last 5 digits common in sequence)or
113123, 123123, 133123, 143123 (2nd digit uncommon rest common in sequence)
123121, 123122, 123123, 123124 (first 5 digits common in sequence)


Need to find such entries.
Please help