[Solved] Regex to split string into array of numbers and characters using PHP

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Use this regex :
(?<=[()\/*+-])(?=[0-9()])|(?<=[0-9()])(?=[()\/*+-])

It will match every position between a digit or a parenthesis and a operator or a parenthesis.
(?<=[()\/*+-])(?=[0-9()]) matches the position with a parenthesis or an operator at the left and a digit or parenthesis at the right
(?<=[0-9()])(?=[()\/*+-]) is the same but with left and right reversed.

Demo here

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solved Regex to split string into array of numbers and characters using PHP