正则表达式查找不指向特定域的链接

Question

确定文本是否包含不指向特定域的链接的好规则是什么？

我找到了这篇文章，但我需要它的反面： Specific domain URL validation with Regular Expression

Answer 1

您可以使用answer your linked 中的确切代码，但将您的逻辑置于“不匹配”的情况下。这是我对 .Net 的快速重写：

Regex r = new Regex(@"^https?://([a-z0-9-]+\.)*blah\.com(/.*)?$";

string[] tests = {
    'http://blah.com/so/this/is/good'
  , 'http://blah.com/so/this/is/good/index.html'
  , 'http://www.blah.com/so/this/is/good/mice.html#anchortag'
  , 'http://anysubdomain.blah.com/so/this/is/good/wow.php'
  , 'http://anysubdomain.blah.com/so/this/is/good/wow.php?search=doozy'
  , 'http://any.sub-domain.blah.com/so/this/is/good/wow.php?search=doozy' 
  , 'http://999.sub-domain.blah.com/so/this/is/good/wow.php?search=doozy' 
  , 'http://obviousexample.com'
  , 'http://bbc.co.uk/blah.com/whatever/you/get/the/idea'
  , 'http://blah.com.example'
  , 'not/even/a/blah.com/url'
}

foreach (string url in tests ) {
  if ( !r.Matches(url) )
  {
    // Did not match
  }
}