如果在C＃中输入的内容如此有效或无效，如何验证URL [英] How to validate URL if valid or invalid if the entry is like this in C#

问题描述

如果条目如下有效或无效，如何验证URL：



www.com - 应无效

http ：//ww.try.net - 应该是无效的

http://winner.com - 应该是有效的

url = null =应该是无效的







以下是我制作的方法，不能验证上述情况。



提前感谢您的帮助



我尝试过：

How to validate URL if valid or invalid if the entry is like this:

www.com - should be invalid
http://ww.try.net - should be invalid
http://winner.com - should be valid
url = null = should be invalid



Below is the method I made which does not validate the above scenario.

Thank you in advance for your kind help

What I have tried:

<pre> public bool IsUrlValid(string webUrl)
        {
            if (webUrl == null) return false;
            return Regex.IsMatch(webUrl, @"(http|https)://(([www\.])?|([\da-z-\.]+))\.([a-z\.]{2,3})$");
        }

推荐答案

）;
}

无论正则表达式是什么，都有内置函数： Uri.IsWellFormedUriString Method（ String，UriKind）（系统） [ ^ ]



例如：

No matter of regex pattern, there's inbuilt function: Uri.IsWellFormedUriString Method (String, UriKind) (System)[^]

Exmaple:

List<string> uris = new List<string>(){"www.com", "http://ww.try.net", "http://winner.com", "url = null"};

var result = uris.Select(x=> new {Uri = x, IsValid = Uri.IsWellFormedUriString(x, UriKind.Absolute)});

foreach(var u in result)
{
	Console.WriteLine("'{0}' is{1}valid", u.Uri, u.IsValid ? " ":" NOT ");
}

结果：

Result:

'www.com' is NOT valid
'http://ww.try.net' is valid
'http://winner.com' is valid
'url = null' is NOT valid

如果你想使用Regex，你可以使用它： ^ http（s）？：//（[\w-] +。）+ [\w - ] +（/ [\\\-。/？％& =]）？

In case, you want to use Regex instead, you can use this: ^http(s)?://([\w-]+.)+[\w-]+(/[\w- ./?%&=])?

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