regex - javascript replace last occurrence of string -

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i've read many q&as in stackoverflow , i'm still having hard time getting regex. have string 12_13_12.

how can replace last occurrence of 12 with, aa.

final result should 12_13_aa.

i explanation how did it.

newstring = oldstring.substring(0,oldstring.lastindexof("_")) + 'aa';

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