Ruby：“〜〜”是什么意思？(Ruby: What does the “!~” operator mean? [duplicate])

Ruby：“〜〜”是什么意思？(Ruby: What does the “!~” operator mean? [duplicate])

这个问题在这里已经有了答案：

！〜方法在Ruby 2中对 String做了什么 回答

当声明语法如：

a !~ b

其中a，b是变量，这是什么意思？

This question already has an answer here:

What does the !~ method do with String in Ruby 2 answers

When declaring syntax such as:

a !~ b

where a,b are variables, what does it mean?

最满意答案

这是正则表达式匹配的否定。

"a" !~ /b/ # => true

当你想要检查一个字符串是否与特定模式不匹配时，这很有用。 例如，如果你想检查字符串s是否只包含数字，那么你可以这样做：

s !~ /\D/

It is negation of =~, a regex match.

"a" !~ /b/ # => true

It is useful when you want to check whether a string does not match a certain pattern. For example, if you want to check if string s includes only numbers, then you can do:

s !~ /\D/