Iterate through a string backwards to find a character or phrase

Question

Is there a good way to start at a given index and move BACKWARDS looking for a given phrase in a string? I only know how to use indexof iterating forwards.

Answer 1

You can use LastIndexOf:

int index = s.LastIndexOf("foo");

It also has an optional start index if you want to start search backwards from somewhere other than the end of the string.

int index = s.LastIndexOf("foo", 20);