如何使用 ruby​​ regexp 用类似“回调函数"的操作替换字符串 [英] How to use ruby regexp to substitute string with a "callback function"-like manipulation

问题描述

我有示例行，我想用 =s 替换前导 #s.(前两行)但是在string.gsub!(/^#+w/, "")中，我无法得到我想要替换的#的数量.

I have the samples lines, and I want to substitute the leading #s with =s. (The first two lines) But instring.gsub!(/^#+w/, ""), I can not get the number of # which I want to substitute.

在 javascript 中，我可以使用带有 replace 方法的回调函数，但是我该如何存档这个 Ruby?

In javascript, I could use a callback function with the replace method, but how could I archive this Ruby?

##Command-line Tool
###Installment
This is a '#'.

预期结果:

==Command-line Tool
===Installment
This is a '#'.

推荐答案

可能是 gsub 方法的回调块函数.我不确定你的想法，但可能是这样的

a callback block function to the gsub method, probably. I am not sure what you had in mind but could be something like

s.gsub(/^(#+)w+/) {|m| m.gsub("#", "=") }

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