如何在正则表达式中转义所有具有特殊含义的字符 [英] How to escape all characters with special meaning in Regex

问题描述

我只是偶然发现了以下我无法理解的内容.当你像这样在 Ruby 中创建一个新的 Regexp 时:

I just stumbled upon the following which I can't quite get my head around. When you create a new Regexp in Ruby like so:

Regexp.new('http://www.example.com')

它将输出以下内容:

/http:\/\/www.example.com/

这是正确的，但没有转义 .;这意味着它基本上允许任何角色出现在那个地方.可以通过以下方式解决此问题:

which is correct, but doesn't escape the .; this means it basically allows for any character to be on that place. Getting around this can be achieved by doing:

Regexp.new(Regexp.escape('http://www.example.com'))
# => /http:\/\/www\.example\.com/

不过这个解决方案看起来有点奇怪，所以也许有更好的解决方案?

This solution looks a little odd though, so maybe there is a better one?

推荐答案

您可以:

Regexp.escape('http://www.example.com')

这将返回完全转义的字符串

That will return the fully escaped string

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