Summary
Your goal was to extract, remove, and replace values in strings. Often, the data you receive has extraneous data or characters that you need to avoid or eliminate before you can use the target data.
Utilizing the IndexOf() method, enabled you to identify the position of a character or string within another string. The position returned from the IndexOf() method was the first building block to using the Substring() method to extract a portion of a string given the starting position and the number of characters to extract (the length). It also enabled you to use the Remove() method to eliminate characters from a string given the starting position and the length. You learned of variations like LastIndexOf() method to find the last position of a character of string within another string, and the IndexOfAny() to find the position of any value of a given char array. You used the while statement to iterate through a longer string to find and extract all instances of a character or string within a larger source string. Finally, you used the Replace() method to swap all instances of a character or string inside of a larger string.
While it might be possible to perform these kinds of operations using a char array, iterating through each char to find matches, keeping track of the starting and ending points you wanted to locate, and so on. It would take many more steps to accomplish what these string helper methods can accomplish in a single call.
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