enhance: allow origins is regexp string

[smithyj]

allow origins is regexp string，need check origin is trusted

[smithyj]

@kevwan

[kevwan]

Would you please add unit test and some details on this PR to describe the scenarios?

[smithyj]

我们的前端域名有很多，而且子域名也有很多，还有不同的端口，比如:

test.baidu.com
three.test.baidu.com
other.baidu.com:4838
...

这种情况下，现有的 cors 组件就有问题了，一个个填写会很麻烦，所以得支持正则表达式，直接将根域名进行信任

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---

We have a lot of front-end domains, and also a lot of subdomains, and different ports, such as:

test.baidu.com
three.test.baidu.com
other.baidu.com:4838
...

In this case, there is a problem with the existing cors components, and it will be very troublesome to fill in one by one, so you have to support regular expressions and directly trust the root domain name

[smithyj]

@kevwan see see

[kevwan]

if strings.HasSuffix(origin, o) {
    return true
}

Should work like a charm.

[kevwan]

if strings.HasSuffix(origin, o) {
    return true
}

Should work like a charm.

[kevwan]

Duplicate of #1827