Code Wars C# 7 kyu: Regex Validate PIN Code

Beginner level C# object oriented programming series. Viewers are provided a string representing an attempt at an ATM PIN code entry. They must perform basic validation, checking whether the input pin contains only digits and is of length 4 or 6. The solution shown will use regular expressions.

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How would I create a regex to find numbers between (170-179)% increased physical damage