MathGroup Archive 2001

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Working with strings

  • To: mathgroup at
  • Subject: [mg31940] Working with strings
  • From: bghiggins at (Brian Higgins)
  • Date: Thu, 13 Dec 2001 01:08:45 -0500 (EST)
  • Sender: owner-wri-mathgroup at

I have a list of string characters that I would like to group in a
particular way. The list has the following structure:

{n UpperCase Characters, x, m UpperCase Characters}

Here is an example:

myString={"S", "T", "M", "x", "R", "K", "P", "G"}

Now I would like to form the following groupings:

{"SxR", "SxK", "SxP", "SxG", "TxR", "TxK", "TxP", "TxG", "MxR", "MxK",
"MxP", \

A brute force way of doing this is

subString[n_] := Split[myString, UpperCaseQ[#2] && UpperCaseQ[#1]

Flatten[Outer[StringJoin, Outer[StringJoin, subString[1],

Does anyone have any elegant way of doing this with perhaps using
replacement rules?

Thanks much,


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