C#: finding instances of a string within a string

Question

Suppose I had the string \"1 AND 2 AND 3 OR 4\", and want to create an array of strings that contains all substrings \"AND\" or \"OR\", in order, found within the string.

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Answer 1

Since you know the exact substring you're looking for... why not just use IndexOf(substr, iOffset) to know the number of occurances (loop till it returns -1) ??

Depending on the complexity of your task, it could be simpler/faster than using regular expressions (since you're not matching patterns).