lastIndexOfString

The `lastIndexOfString` method is a string manipulation function used in programming to locate the last occurrence of a specified substring within a given string. It returns the zero-based index of the last found occurrence, or -1 if the substring is not present.

This method is commonly found in object-oriented programming languages, particularly those with a string class, such as Java, JavaScript, and C++. The function operates similarly to `indexOfString`, which searches for the first occurrence of a substring, but instead scans the string from the end to the beginning.

In Java, for example, the method is part of the `String` class and is declared as `public int lastIndexOf(String str)`. It accepts a single parameter, the substring to search for, and returns an integer representing its position. If the substring is empty, the method returns the length of the original string, as an empty string is considered to exist at every possible position.

The `lastIndexOfString` function is useful in scenarios where the most recent occurrence of a character or sequence matters, such as parsing or validating input, processing log files, or handling text-based configurations. For instance, it can help identify the last occurrence of a delimiter in a string, which might be necessary for splitting or extracting data.

Unlike some other string search methods, `lastIndexOfString` does not modify the original string; it only returns the position of the substring. This makes it a non-destructive operation, preserving the integrity of the input data. Developers often combine this method with substring extraction or other string operations to further process the found segment.