Ruby中字符串中选定字符替换的所有可能组合 [英] All possible combinations of selected character substitution in a string in ruby

问题描述

我想知道是否有一种简单的方法可以以简单的方式在ruby中完成所选字符替换的每种组合。

I was wondering if there is a simple way to do every combination of selected character substitutions in ruby in a simple way.

示例：

    string = "this is a test"
    subs = ['a'=>'@','i'=>'!','s'=>'$']
    subs.combination.each { |c|
        string.gsub c
    }

将产生收益

    "this is @ test"
    "th!s !s a test"
    "thi$ i$ a te$t"
    "th!s !s @ test"
    "thi$ i$ @ te$t"
    "th!$ !$ a te$t"
    "th!$ !$ @ te$t"

感谢您的帮助！

推荐答案

string = "this is a test"
subs = ['a'=>'@','i'=>'!','s'=>'$']

subs = subs.first.map(&:to_a)
1.upto(subs.length).each do |n|
  subs.combination(n).each do |a|
    p a.each_with_object(string.dup){|pair, s| s.gsub!(*pair)}
  end
end

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