Question

我想在字符串中查找给定子字符串的实例，并随机替换它：不是在它的每个实例中，而是仅仅是esporadically。我正在考虑为子串的每个实例使用.each方法，然后使用rand在代码块内部根据结果替换它。但是我对如何在这种情况下实现.each方法感到有些困惑。有人可以帮忙吗？（我使用的是Ruby 1.9）

Answer 1

您可以使用String#gsub的块变体：

s = 'foo bar foo bar foo bar foo bar'
# and you want to change random instances of "foo" with "baz":
s.gsub(/foo/){|m| rand(2) == 0 ? 'baz' : m}
#=> "baz bar foo bar baz bar foo bar"

Answer 2

# this is original string
mystring = "some long string"
# this is given substring
substring = "some substring"
# this is raplace string (should be blank)
replace = "some substring replace"
# this is a loop
mystring.split(substring).inject{|new, chunk| new += (rand(2) == 0 ? substring : replace) + chunk }

例如：

mystring = "hello hello my dear friends! hello and goodbye after hello!"
substring = "hello"
replace = "pinky"
mystring.split(substring).inject{|new, chunk| new += (rand(2) == 0 ? substring : replace) + chunk }
#=> "hello pinky my dear friends! pinky and goodbye after hello!"

替换字符串中的子串的随机实例（ruby）

2 个答案: