正则表达式匹配带有可选的“www"和协议的

有一堆正则表达式可以匹配 url，但我发现没有一个可以在 http 和 www 上进行可选匹配.

there are a bunch of regexps out there to match urls but none I have found do an optional match on the http and www.

我想知道匹配的模式是否可能是这样的:

i'm wondering if the pattern to match could be something like:

^([a-z]).(com|ca|org|etc)(.)

我想也许另一个选择是匹配任何包含点 (.) 的字符串.(因为我的应用程序中的其他 REQUEST_URI 通常不包含点)

I thought maybe another option was to perhaps just match any string that had a dot (.) in it. (as the other REQUEST_URI's in my application typically won't contain dots)

这对任何人都有意义吗?我真的很感谢在这方面的帮助，因为它已经阻止了我的项目数周.

Does this make sense to anyone? I'd really appreciate some help with this its been blocking my project for weeks.

非常感谢-蒂姆

推荐答案

我建议使用一种简单的方法，基本上是建立在你所说的基础上，只是任何带有点的东西，但也使用正斜杠.捕获所有内容而不会错过不寻常的 URL.所以就像:

I suggest using a simple approach, essentially building on what you said, just anything with a dot in it, but working with the forward slashes too. To capture everything and not miss unusual URLs. So something like:

^((?:https?://)?[^./]+(?:.[^./]+)+(?:/.*)?)$

它读作:

• 可选 http://或 https://
• 非点或正斜杠字符
• 一组或多组点后跟非点或正斜杠字符
• 可选的正斜杠及其后的任何内容

将整个事物捕获到第一个分组.

Capturing the whole thing to the first grouping.

它会匹配，例如:

• nic.uk
• nic.uk/
• http://nic.uk
• http://nic.uk/
• https://example.com/test/?a=bcd

验证它们是有效的 URL 是另一回事！它也会匹配:

Verifying they are valid URLs is another story! It would also match:

• index.php

它不会匹配:

• 目录/index.php

最小匹配基本上是something.something，其中没有正斜杠，除非它在点之后至少出现一个字符.因此，请确保不要将这种格式用于其他任何用途.

The minimal match is basically something.something, with no forward slash in it, unless it comes at least one character past the dot. So just be sure not to use that format for anything else.

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