Thanks... I didn see a reference to it in the thread that I got the while loop from but it noted that TR can only be used with single characters? which works in this case but maybe not others? I did try the TR thing and it does work for my data set without a memory error.
Are you sure this is the most efficient way to do this? Seems like to me that its creating a copy of the original string and trying to replace the matches before it outputs the count. (as far as i can tell given reading a quick page on teh TR function) I wouldn't think that would be as memory efficient as the while code... but I don't understand the internals of the while code either, if it instantiates a huge list the interates through them, I can see how that wouldn't be as efficient as teh TR code.
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