subsgtitute string R

To substitute a string in Lua, you can use the string.gsub function. This function takes three arguments: the original string, the pattern to match, and the replacement string. It returns a new string with all occurrences of the pattern replaced by the replacement string.

Here are the steps to perform string substitution in Lua:

1. Import the string module (if it's not already imported). This module provides various functions for manipulating strings, including the gsub function.

lua require("string")

1. Define the original string that you want to modify.

lua local originalString = "Hello, world!"

1. Define the pattern that you want to match. This can be a plain string or a pattern using Lua's pattern matching syntax. Patterns can include character classes, repetitions, and other constructs.

lua local pattern = "world"

1. Define the replacement string that you want to use. This will be the string that replaces all occurrences of the pattern in the original string.

lua local replacement = "Lua"

1. Use the string.gsub function to perform the substitution. Pass in the original string, the pattern, and the replacement string as arguments. Assign the result to a new variable.

lua local newString = string.gsub(originalString, pattern, replacement)

The gsub function scans the original string and replaces all occurrences of the pattern with the replacement string. It returns a new string with the substitutions applied.

1. The newString variable now contains the modified string with the substitutions made. You can use it as needed in your code.

lua print(newString) -- Output: Hello, Lua!

This is how you can substitute a string in Lua using the string.gsub function.