Example analysis USES regular expressions to match a tags in js and c-sharp

  • 2020-03-30 04:25:53
  • OfStack

Without further ado, it's all in the code, straight up

JS code:


<html>
<head>
<script language="javascript">
    var a='<P><A href='~abc/ccg/ab.jpg' width="3"> The text </A><A width="4" style="color:#ddd; font-weight:bold;" mm_href="http:www.baidu.com"  href="http://bbs.cn.yimg.com/user_img/200701/31/soso1.jpg" mce_href="http://bbs.cn.yimg.com/user_img/200701/31/jisuanji986_117025184198149.jpg">cc</A> href="www.baidu.com" cbas <span>cchref</span> 1<a dd href="ccc"  <A width="5" href="http://bbs.cn.yimg.com/user_img/200701/31/soso2.jpg" mce_href="http://bbs.cn.yimg.com/user_img/200701/31/cc.jpg"></A></P>';
   
    var b=/<a([s]+|[s]+[^<>]+[s]+)href=("([^<>"']*)"|'([^<>"']*)')[^<>]*>/gi;
    var s=a.toLowerCase().match(b);
    alert(s.length);
    for(var i= 0;i<s.length;i++)
    {
        var ss = s[i].toLowerCase().match(b);
        alert(RegExp.$3+RegExp.$4);
    }
</script>
</head>
<body>
</body>
</html>

C # code:


string html = "<P><A href='~abc/ccg/ab.jpg' height="4" width='3' > The text </A><A width="4" style="color:#ddd; font-weight:bold;" mm_href="http:www.baidu.com"  href="http://bbs.cn.yimg.com/user_img/200701/31/soso1.jpg" mce_href="http://bbs.cn.yimg.com/user_img/200701/31/jisuanji986_117025184198149.jpg">cc</A> href="www.baidu.com" cbas <span>cchref</span>  1<a df href="cc"   <A width="5" href="http://bbs.cn.yimg.com/user_img/200701/31/soso2.jpg" mce_href="http://bbs.cn.yimg.com/user_img/200701/31/cc.jpg"></A></P>";
Regex reg = new Regex("<a([\s]+|[\s]+[^<>]+[\s]+)href=("(?<href>[^<>"']*)"|'(?<href>[^<>"']*)')[^<>]*>", RegexOptions.IgnoreCase);
MatchCollection matchCollection = reg.Matches(html);
MessageBox.Show(matchCollection.Count.ToString());
foreach (Match match in matchCollection)
{
    MessageBox.Show(match.Groups["href"].ToString());
}

Have you seen the similarities and differences in the use of regular expressions in js and C#? If you have any questions, please leave a message for us to discuss.


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