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Suppose we have a list of the following:

l={"applejuice","lemon_juiceginger"}

How can one modifies this to read as: 

{"apple:juice","lemon_juice:ginger"}

I have tried StringRiffle[] but wasn't so successful.

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    $\begingroup$ How do you determine where to insert the :? The example is not self-explanatory. $\endgroup$
    – Szabolcs
    Commented Jan 21, 2019 at 14:19
  • $\begingroup$ after each known word, apple is known so as juice. problem is with enteries like lemon_juice where there is "_". $\endgroup$
    – Wiliam
    Commented Jan 21, 2019 at 14:21
  • $\begingroup$ Assuming you need to detect and split words, have you tried any techniques from answers to your recent question: mathematica.stackexchange.com/q/189303/5478? $\endgroup$
    – Kuba
    Commented Jan 21, 2019 at 14:21
  • $\begingroup$ @William what kind of problem because "after each known word" means that "lemon_juiceginger" should be "lemon:_juice:ginger:". $\endgroup$
    – Kuba
    Commented Jan 21, 2019 at 14:22
  • $\begingroup$ @Kuba I have tried the method I asked in previous post. The "_" is the reason I am asking this here. Let me be specific. the ":" should go after the first known word. One expects "apple:juice" which is fine. Yet when there is "lemon_juiceginger" you get "lemon:_juiceginger" how would one sort the string such that it understand lemon_juice is one word? $\endgroup$
    – Wiliam
    Commented Jan 21, 2019 at 14:25

1 Answer 1

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We can use a slight modification of the function reArrange from this answer:

ClearAll[reArrange2]
reArrange2[s_String] := ## & @@ 
  StringCases[s, StartOfString ~~ beg__ ~~ w__ ~~ EndOfString /; 
    (And @@ DictionaryWordQ /@ {w, ## & @@ StringSplit[beg, "_"]}) :> 
     StringRiffle[{beg, w}, ":"]]

reArrange2 /@ l

{"apple:juice", "lemon_juice:ginger"}

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