We have learnt that tr method can be used to replace individual characters in a string.
Now, let's say we want to replace a continuous chunk of string within a larger string (also called a substring), with something else. For example, we want to convert the string twist into test. In such cases, we can use the gsub method.
The gsub method replaces the substring provided in the first argument, with the substring provided in the second argument.
The gsub method can also be used to remove characters from a string. Just set the second argument to an empty string.