What is the difference between gsub and sub methods for Ruby Strings

Question

I have been perusing the documentation for String today, and I saw the :sub method, which I\'d never noticed before. I\'ve been using :gsub

Answer 1

The g stands for global, as in replace globally (all):

In irb:

>> "hello".sub('l', '*')
=> "he*lo"
>> "hello".gsub('l', '*')
=> "he**o"