Split string into array without deleting delimiter?

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Instead of splitting, it might be easier to think of this as extracting strings comprising either the delimiter or consecutive characters that are not the delimiter:

'asdf a  b c2 '.match(/\S+|\s/g)
// result: ["asdf", " ", "a", " ", " ", "b", " ", "c2", " "]
'asdf a  b. . c2% * '.match(/\S+|\s/g)
// result: ["asdf", " ", "a", " ", " ", "b.", " ", ".", " ", "c2%", " ", "*", " "]

A more Shakespearean definition of the matches would be:

'asdf a  b c2 '.match(/ |[^ ]+/g)

To or (not to )+.

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