您没有指定使用哪种语言。 如果PHP是，有一个本地函数:

$url = 'http://www.yoururl.co.uk/sub1/sub2/?param=1&param2/';

if ( ! filter_var( $url, FILTER_VALIDATE_URL ) ) {
    // Wrong
}
else {
    // Valid
}

返回过滤后的数据，如果过滤失败则返回FALSE。

看看这里>>

希望能有所帮助。

什么平台?如果使用。net，请使用System.Uri。TryCreate，不是正则表达式。

例如:

static bool IsValidUrl(string urlString)
{
    Uri uri;
    return Uri.TryCreate(urlString, UriKind.Absolute, out uri)
        && (uri.Scheme == Uri.UriSchemeHttp
         || uri.Scheme == Uri.UriSchemeHttps
         || uri.Scheme == Uri.UriSchemeFtp
         || uri.Scheme == Uri.UriSchemeMailto
            /*...*/);
}

// In test fixture...

[Test]
void IsValidUrl_Test()
{
    Assert.True(IsValidUrl("http://www.example.com"));
    Assert.False(IsValidUrl("javascript:alert('xss')"));
    Assert.False(IsValidUrl(""));
    Assert.False(IsValidUrl(null));
}

(感谢@Yoshi提供javascript技巧:)

最佳正则表达式是这里最佳答案的组合!哈哈哈!我刚刚测试了它们，并把最好的放在一起!我稍微改变了一下，只有一个捕获组!我在这个页面的源代码中找到了637个url !只有几个假阳性!

((?:(?:https?|ftp)://)(?:\S+(?::\S*)?@|\d{1,3}(?:\.\d{1,3}){3}|(?:(?:[a-z\d\x{00a1}-\x{ffff}]+-?)*[a-z\d\x{00a1}-\x{ffff}]+)(?:\.(?:[a-z\d\x{00a1}-\x{ffff}]+-?)*[a-z\d\x{00a1}-\x{ffff}]+)*(?:\.[a-z\x{00a1}-\x{ffff}]{2,6}))(?::\d+)?(?:[^\s]*)|(?:(?:(?:[A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+(?::[0-9]+)?|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)(?:(?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[\w]*))?)|(?:(?:(?:(?:[A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)(?:(?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[\w]*))?))|(?:(?:(?:[\\w]+:)?//)?(?:(?:[\\d\\w]|%[a-fA-f\\d]{2,2})+(?::(?:[\\d\\w]|%[a-fA-f\\d]{2,2})+)?@)?(?:[\\d\\w][-\\d\\w]{0,253}[\\d\\w]\\.)+[\\w]{2,4}(?::[\\d]+)?(?:/(?:[-+_~.\\d\\w]|%[a-fA-f\\d]{2,2})*)*(?:\\?(?:&?(?:[-+_~.\\d\\w]|%[a-fA-f\\d]{2,2})=?)*)?(?:#(?:[-+_~.\\d\\w]|%[a-fA-f\\d]{2,2})*)?)|(?:https?:\/\/(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)+[a-z0-9][a-z0-9-]{0,61}[a-z0-9])(?::?\d*)\/?(?:[a-z_\/0-9\-#.]*)\??(?:[a-z_\/0-9\-#=&]*)|(?:(?:(?:https?:)?(?:\/?\/))(?:(?:[\d\w]|%[a-fA-f\d]{2,2})+(?::(?:[\d\w]|%[a-fA-f\d]{2,2})+)?@)?(?:[\d\w][-\d\w]{0,253}[\d\w]\.)+[\w]{2,63}(?::[\d]+)?(?:/(?:[-+_~.\d\w]|%[a-fA-f\d]{2,2})*)*(?:\?(?:&?(?:[-+_~.\d\w]|%[a-fA-f\d]{2,2})=?)*)?(?:#(?:[-+_~.\d\w]|%[a-fA-f\d]{2,2})*)?)|(?:(?:https?|ftp)://(?:www\d?|[a-zA-Z0-9]+)?\.[a-zA-Z0-9-]+(?:\:|\.)(?:[a-zA-Z0-9.]+|(?:\d+)?)(?:[/?:].*)?)|(?:\b(?:(?:https?|ftp):\/\/)(?:\S+(?::\S*)?@)?(?:(?!10(?:\.\d{1,3}){3})(?!127(?:\.\d{1,3}){3})(?!169\.254(?:\.\d{1,3}){2})(?!192\.168(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)(?:\.(?:[a-z\x{00a1}-\x{ffff}0-9]+-?)*[a-z\x{00a1}-\x{ffff}0-9]+)*(?:\.(?:[a-z\x{00a1}-\x{ffff}]{2,})))(?::\d{2,5})?(?:\/[^\s]*)?\b))

要将URL匹配到域:

(^(\bhttp)(|s):\/{2})(?=[a-z0-9-_]{1,255})\.\1\.([a-z]{3,7}$)

可以简化为:

(^(\bhttp)(|s):\/{2})(?=[a-z0-9-_.]{1,255})\.([a-z]{3,7})

后者不检查结束行的结束，以便稍后使用它创建具有完整路径和查询字符串的完整URL。

下面是针对这种情况的最佳和最匹配的正则表达式

^(?:http(?:s)?:\/\/)?(?:www\.)?(?:[\w-]*)\.\w{2,}$

我使用这个正则表达式:

((https?:)?//)?(([\d\w]|%[a-fA-f\d]{2,2})+(:([\d\w]|%[a-fA-f\d]{2,2})+)?@)?([\d\w][-\d\w]{0,253}[\d\w]\.)+[\w]{2,63}(:[\d]+)?(/([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)*(\?(&?([-+_~.\d\w]|%[a-fA-f\d]{2,2})=?)*)?(#([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)?

同时支持:

http://stackoverflow.com
https://stackoverflow.com

和:

//stackoverflow.com