What's the most efficient way to format the following string?

Posted by Ian P on Stack Overflow See other posts from Stack Overflow or by Ian P
Published on 2010-05-20T17:51:51Z Indexed on 2010/05/20 18:00 UTC
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c#

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formatting

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string

I have a very simple question, and I shouldn't be hung up on this, but I am. Haha!

I have a string that I receive in the following format(s):

123

123456-753

123455-43

234234-4

123415

The desired output, post formatting, is:

123-455-444

123-455-55

123-455-5

or

123-455

The format is ultimately dependent upon the total number of characters in the original string..

I have several ideas of how to do this, but I keep thing there's a better way than string.Replace and concatenate...

Thanks for the suggestions..

Ian

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