'REGEX Positive look ahead in REGEXEXTRACT GSheet formula

I have a STRING which can contain 1 or more numbers. Same situation for words. I'm look for 2 uniques REGEX formulas (GSheets REGEXTRACT or MATCH compliant)

String : "4 x 120g" OR "120g"

(desired) results :

Last number : 120
Last word : g

Here is a link to my headache



Solution 1:[1]

try in C2:

=INDEX(REGEXEXTRACT(A2:A3; "(?i)([a-z]+$)"))

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Solution Source
Solution 1 player0