algorithm - Splitting strings into letter keys and integers

I have strings of the following form:

string = "ABC123DEFG456HI89UZXX1";

Letter keys of variable lengths are followed by (positive) integers.

I want to get this transformation:

{{"ABC", 123}, {"DEFG", 456}, {"HI", 89}, {"UZXX", 1}}

I have written:

chars = Characters @ string;


runs = Length /@ Split[IntegerQ @ ToExpression @ # & /@ chars]

{3, 3, 4, 3, 2, 2, 4, 1}

takes = Transpose[{# - runs + 1, #}] & [Accumulate @ runs]

{{1, 3}, {4, 6}, {7, 10}, {11, 13}, {14, 15}, {16, 17}, {18, 21}, {22, 22}}

 result =
    Partition[StringJoin /@ Map[Take[chars, #] &, takes], 2] /.
       {a_String, b_String} :> {a, ToExpression @ b}

{{"ABC", 123}, {"DEFG", 456}, {"HI", 89}, {"UZXX", 1}}

I have two questions:

(1) How could the above coding be shortened / improved? (it seems to be too long for such a trivial problem)

(2) How would a "direct" method (StringCases , StringSplit ...) look like?

Answer

You asked for shortened, improved, so here it is using RegularExpressions:

StringCases[string, RegularExpression["(\\D+)(\\d+)"] :> {"$1", ToExpression["$2"]}]

{{"ABC", 123}, {"DEFG", 456}, {"HI", 89}, {"UZXX", 1}}

Here's a version using StringSplit:

Partition[StringSplit[string, RegularExpression["(\\d+)"] :> FromDigits @ "$1"], 2]

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