Ruby 字符串的 gsub 和 sub 方法有什么区别 [英] What is the difference between gsub and sub methods for Ruby Strings

问题描述

今天我一直在阅读 String 的文档，我看到了 :sub 方法，这是我以前从未注意到的.我一直在使用 :gsub 并且它们似乎基本相同.任何人都可以向我解释其中的区别吗?谢谢！

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 and it appears that they are essentially the same. Can anyone explain the difference to me? Thanks!

推荐答案

g 代表 global，如替换 global (all):

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

在 irb 中:

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

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