Consecutive Character Sequences

Walter Brunswick walterbrunswick at
Thu Jul 14 02:07:11 CEST 2005

Is there any way to [efficiently] iterate through a sequence of characters to find N [or more] consecutive equivalent characters?

So, for example, the string "taaypiqee88adbbba" would return 1 if the number (of consequtive characters) supplied in the parameters 
of the function call was 2 or 3, because "a", "e", 8, and "b" is repeated 2 or 3 times.

Thanks for any assistance.
W. Brunswick. 

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