get last characters of string lua

To get the last characters of a string in Lua, you can use the string.sub function along with the string.len function. Here are the steps:

  1. First, you need to determine the length of the string using the string.len function. This function takes a string as an argument and returns the length of the string.

  2. Next, you can use the string.sub function to extract the last characters of the string. This function takes three arguments: the string you want to extract characters from, the starting index of the substring, and the ending index of the substring.

  3. To extract the last characters, you need to calculate the starting index. Subtract the desired number of characters from the length of the string to get the starting index. For example, if you want to extract the last 3 characters, and the length of the string is 10, then the starting index would be 10 - 3 + 1 = 8.

  4. Finally, pass the string, the calculated starting index, and the length of the string as arguments to the string.sub function. This will return the last characters of the string.

Here is an example of how you can implement this in Lua:

local str = "Hello, World!"
local numCharacters = 5 -- number of characters you want to extract

local startingIndex = string.len(str) - numCharacters + 1
local lastCharacters = string.sub(str, startingIndex)

print(lastCharacters) -- Output: "World!"

In this example, the string.len function calculates the length of the string "Hello, World!", which is 13. Then, the starting index is calculated as 13 - 5 + 1 = 9. Finally, the string.sub function extracts the last 5 characters from the string, resulting in "World!" being printed to the console.