当该字符串不包含任何字符时，为什么我的字符串与数组中的某些字符匹配? [英] Why is my string matching something in an array when that string doesn't contain any of those characters?

问题描述

使用Rails 5和Ruby 2.4.我不明白为什么下面的匹配.我有一个字符串数组，我想看看我的字符串是否与数组中的任何字符串匹配，所以我尝试了

Using Rails 5 and Ruby 2.4. I can't understand why the below is matching . I have an array of strings and I want to see if my string matches any of those in the array, so I tried this

2.4.0 :021 > SEPARATOR_TOKENS = ["-"]
 => ["-"]
2.4.0 :022 > data = "W40"
 => "W40"
2.4.0 :023 > data =~ /[#{Regexp.union(SEPARATOR_TOKENS)}]/
 => 0

即使我的字符串中没有-"，它仍报告匹配.我该如何纠正?注意，我从根本上简化了此示例，因此使用".include?"不是一种选择，因为我正在做的事情最终将包含正则表达式.

even though there is no "-" in my string, it is reporting a match. HOw do I correct this? Note, I have radically sipmlified this example so using an ".include?" is not an option because what I'm doing will eventually include regular expressions.

推荐答案

Regexp.union已经生成了一个正则表达式，您无需使用/.../

Regexp.union already produces a regular expression, you don't need to use /.../

尝试一下:

data =~ Regexp.union(SEPARATOR_TOKENS)

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