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string.gsub() function in Lua programming
There are scenarios when we want to change a pattern that we found in a string with our pattern, and in Lua for that we have a famous library function, named the string.gsub() function.
The string.gsub() function has three arguments, the first is the subject string, in which we are trying to replace a substring to another substring, the second argument is the pattern that we want to replace in the given string, and the third argument is the string from which we want to replace the pattern.
Syntax
string.gsub(x,a,b)
In the above syntax, the x identifier is used to denote the string in which we are trying to replace a pattern, the a identifier is the pattern that we want to replace, and the b identifier is the pattern with which we want to replace the substring that we found.
Example
Now, let’s consider a basic example of the string.gsub() in Lua.
Consider the example shown below −
s = string.gsub("Lua is good", "good", "great")
print(s)--> Lua is greatOutput
Lua is great
Example
Let’s consider one more simple example, so that you understand it completely.
Consider the example shown below −
s = string.gsub("hello lii", "l", "x")
print(s)Output
hexxo xii
It should be noted that if we provide a pattern that is not present in the string, then nothing will change, the string will remain the same.
Example
Consider the example shown below −
s = string.gsub("Lua is good", "ok", "great")
print(s)Output
Lua is good
There’s also a fourth argument that we can pass in the string.gsub() function and that fourth argument will be used to limit the number of substitutions to be made.
Example
Consider the example shown below −
s = string.gsub("lua is lua and lua", "lua", "he",2)
print(s)Output
he is he and lua
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