Question

我需要验证网址并检查输入的网址是域名还是子域名我尝试了一个解决方案，但是在某些情况下它失败了。

function subDomain(url) 
{

    // IF THERE, REMOVE WHITE SPACE FROM BOTH ENDS
    url = url.replace(new RegExp(/^\s+/),""); // START
    url = url.replace(new RegExp(/\s+$/),""); // END

    // IF FOUND, CONVERT BACK SLASHES TO FORWARD SLASHES
    url = url.replace(new RegExp(/\\/g),"/");

    // IF THERE, REMOVES 'http://', 'https://' or 'ftp://' FROM THE START
    //url = url.replace(new RegExp(/^http\:\/\/|^https\:\/\/|^ftp\:\/\//i),"");

    // IF THERE, REMOVES 'www.' FROM THE START OF THE STRING
    url = url.replace(new RegExp(/^www\./i),"");

    // REMOVE COMPLETE STRING FROM FIRST FORWARD SLASH ON
    url = url.replace(new RegExp(/\/(.*)/),"");

    // REMOVES '.??.??' OR '.???.??' FROM END - e.g. '.CO.UK', '.COM.AU'
    if (url.match(new RegExp(/\.[a-z]{2,3}\.[a-z]{2}$/i))) {
        url = url.replace(new RegExp(/\.[a-z]{2,3}\.[a-z]{2}$/i),"");

    // REMOVES '.??' or '.???' or '.????' FROM END - e.g. '.US', '.COM', '.INFO'
    } else if (url.match(new RegExp(/\.[a-z]{2,4}$/i))) {
        url = url.replace(new RegExp(/\.[a-z]{2,4}$/i),"");
    }

    // CHECK TO SEE IF THERE IS A DOT '.' LEFT IN THE STRING
    var subDomain = (url.match(new RegExp(/\./g))) ? true : false;
    return(subDomain);
}

结果：

 
mydomain.com -> false 

subdomain.mydomain.com -> true

mydomain.com. -> true

Answer 1

你可以在一个正则表达式中实际测试它，例如：

var isSubdomain = function(url) {
    url = url || 'http://www.test-domain.com'; // just for the example
    var regex = new RegExp(/^([a-z]+\:\/{2})?([\w-]+\.[\w-]+\.\w+)$/);

    return !!url.match(regex); // make sure it returns boolean
}

console.log(isSubdomain("example.com"));
console.log(isSubdomain("http://example.com:4000"));
console.log(isSubdomain("www.example.com:4000"));
console.log(isSubdomain("https://www.example.com"));
console.log(isSubdomain("sub.example.com"));
console.log(isSubdomain("example.co.uk")); //it doesn't work on these very specific cases

Answer 2

您只需使用URI即可。 https://medialize.github.io/URI.js/docs.html

const subdomain = new URI('https://stackoverflow.com/questions/14644805/validate-url-and-check-if-url-is-domain-or-subdomain').subdomain()

subdomain // Will be an empty string if no subdomain exists

然后在函数中使用它

function isSubdomain(url) {
  return Boolean(new URI(url).subdomain())
}

验证url并检查url是域还是子域

2 个答案: