检查JavaScript字符串是否是URL

在JavaScript中是否有一种方法来检查字符串是否是URL?

regex被排除在外，因为URL很可能写成stackoverflow;也就是说，它可能没有。com, WWW或http。

当前回答

对已接受答案的改进…

Check for ftp/ftps as protocol Has double escaping for backslashes (\\) Ensures that domains have a dot and an extension (.com .io .xyz) Allows full colon (:) in the path e.g. http://thingiverse.com/download:1894343 Allows ampersand (&) in path e.g http://en.wikipedia.org/wiki/Procter_&_Gamble Allows @ symbol in path e.g. https://medium.com/@techytimo isURL(str) { var pattern = new RegExp('^((ft|htt)ps?:\\/\\/)?'+ // protocol '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name and extension '((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address '(\\:\\d+)?'+ // port '(\\/[-a-z\\d%@_.~+&:]*)*'+ // path '(\\?[;&a-z\\d%@_.,~+&:=-]*)?'+ // query string '(\\#[-a-z\\d_]*)?$','i'); // fragment locator return pattern.test(str); }

2017-08-08 11:55:55

其他回答

我使用下面的函数来验证URL是否有http/https:

2018-04-16 04:04:28

如果你想检查一个字符串是否是有效的HTTP URL，你可以使用URL构造函数(它会抛出一个畸形的字符串):

函数isValidHttpUrl(string) { 让url; 尝试{ url =新的url(字符串); } catch (_) { 返回错误; ｝返回的url。Protocol === "http:" || url。协议=== "https:"; ｝ console.log (" http://example.com " + isValidHttpUrl (" https://example.com ")); console.log (" example.com " + isValidHttpUrl (" example.com "));

注意:根据RFC 3886, URL必须以一个方案开头(不限于http/https)，例如:

www.example.com不是有效的URL(缺少方案) void(0)是有效的URL，但不是HTTP URL http://.。是有效的URL，主机是..(是否解析取决于你的DNS) https://example..com是有效的URL，与上面相同

2017-04-18 08:22:24

这里还有另一种方法。

// ***note***: if the incoming value is empty(""), the function returns true var elm; function isValidURL(u){ //A precaution/solution for the problem written in the ***note*** if(u!==""){ if(!elm){ elm = document.createElement('input'); elm.setAttribute('type', 'url'); } elm.value = u; return elm.validity.valid; } else{ return false } } console.log(isValidURL('')); console.log(isValidURL('http://www.google.com/')); console.log(isValidURL('//google.com')); console.log(isValidURL('google.com')); console.log(isValidURL('localhost:8000'));

2018-04-18 22:24:17

使用纯正则表达式很难做到这一点，因为url有很多“不方便”的地方。

For example domain names have complicated restrictions on hyphens: a. It is allowed to have many consecutive hyphens in the middle. b. but the first character and last character of the domain name cannot be a hyphen c. The 3rd and 4th character cannot be both hyphen Similarly port number can only be in the range 1-65535. This is easy to check if you extract the port part and convert to int but quite difficult to check with a regular expression. There is also no easy way to check valid domain extensions. Some countries have second-level domains(such as 'co.uk'), or the extension can be a long word such as '.international'. And new TLDs are added regularly. This type of things can only be checked against a hard-coded list. (see https://en.wikipedia.org/wiki/Top-level_domain) Then there are magnet urls, ftp addresses etc. These all have different requirements.

然而，这里有一个函数可以处理几乎所有的事情，除了:

案例1。c 接受任何1-5位数的端口号接受任何扩展2-13个字符不接受ftp，磁铁等…

2019-02-10 19:51:48

该功能不允许localhost，只允许web页面的url(即只允许http或https协议)。

它也只允许这里定义的安全字符:https://www.urlencoder.io/learn/

function isValidWebUrl(url) {
   let regEx = /^https?:\/\/(?:www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)$/gm;
   return regEx.test(url);
}

2020-08-07 21:04:11

检查JavaScript字符串是否是URL

推荐文章

最新文章

标签