C# Regex to extract (n-3) and (n-2) character, where n is the length of the string

Question

Need regex expression in C# to extract 2 digits from the last but 2 digits.

For example consider the string "QWEREIA89RR". Here I want to extract "89"

question from:https://stackoverflow.com/questions/66051887/c-sharp-regex-to-extract-n-3-and-n-2-character-where-n-is-the-length-of-the

Answer 1

Here is a approach with linq

string input = "Q1WEREIA89RR";
string result = string.Concat(input.Where(char.IsDigit).Reverse().Take(2).Reverse());