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

你可以使用URL原生API:

  const isUrl = string => {
      try { return Boolean(new URL(string)); }
      catch(e){ return false; }
  }

2018-03-14 17:05:56

其他回答

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

如果你也需要支持https://localhost:3000，那么使用[Devshed]s regex的修改版本。

    function isURL(url) {
        if(!url) return false;
        var pattern = new RegExp('^(https?:\\/\\/)?'+ // protocol
            '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name
            '((\\d{1,3}\\.){3}\\d{1,3}))|' + // OR ip (v4) address
            'localhost' + // OR localhost
            '(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // port and path
            '(\\?[;&a-z\\d%_.~+=-]*)?'+ // query string
            '(\\#[-a-z\\d_]*)?$', 'i'); // fragment locator
        return pattern.test(url);
    }

2020-01-13 23:08:12

你可以使用URL原生API:

  const isUrl = string => {
      try { return Boolean(new URL(string)); }
      catch(e){ return false; }
  }

2018-03-14 17:05:56

和我一起工作

function isURL(str) {
  var regex = /(http|https):\/\/(\w+:{0,1}\w*)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%!\-\/]))?/;
  var pattern = new RegExp(regex); 
return pattern.test(str);
}

2019-04-16 16:02:53

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

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