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1

I have a list:

lis = {"ab", "cde", 2,"rs",3,"tu","v","w",7}

and would like to get the following list:

lis2 = {abcde, 2,rs, 3,tuvw,7}

... with adjacent strings joined and separated by integers.

Any thoughts would be appreciated!

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up vote 4 down vote accepted

If you don't mind code that generates messages, then the following will work:

Quiet[List@@StringJoin[lis],StringJoin::string]

(* {abcde,2,rs,3,tuvw,7} *)
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Excellent! Thanks – Suite401 4 hours ago
up vote 4 down vote 
lis = {"ab", "cde", 2, "rs", 3, "tu", "v", "w", 7};

lis //. {s___, str1_String, str2_String, f___} :>
  {s, StringJoin[str1, str2], f}

(*  {"abcde", 2, "rs", 3, "tuvw", 7}  *)

or

lis //. {s___, str1_String, str2_String, f___} :>
  {s, str1 <> str2, f}
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up vote 3 down vote

This is a bit elaborate:

If[VectorQ[#, StringQ], StringJoin[#], Sequence @@ #] & /@ SplitBy[lis, StringQ]
   {"abcde", 2, "rs", 3, "tuvw", 7}
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