正则表达式匹配和子字符串合而为一？

Question

I have a HTML source as input and would like to know what CMS the website is made in. Many CMS leave their name in a meta tag like this:

<meta name="Generator" content="MY CMS" />   

I can get the result like this:

        Match match = Regex.Match(html, ".*(?i)meta.*generator.*");
        match = Regex.Match(match.ToString(), "content.*\".*\"");
        match = Regex.Match(match.ToString(), "\".*\"");

Gives me "MY CMS"

But is there any way to shorten it down to one Regex.Match?

Please notice, that the meta tag could be like this:

<meta content="MY CMS" name="Generator" />

Thanks and best regards

Answer 1

var regex = new Regex(@"<meta\s+name=""Generator""\s+content=""([^""]+)""", RegexOptions.IgnoreCase);
var match = regex.Match(html);
var generator = match.Groups[1].Value;

Answer 2

Try the following:

Regex regex = new Regex(@"<meta[^>]+content\s*=\s*['"]([^'"]+)['"][^>]*>");
Match match = regex.Match(input);

The value is in group 1.

Hope it helps.

Answer 3

Regex is not a good choice for parsing HTML files..

HTML is not strict nor is it regular with its format..

Use htmlagilitypack

Regex is used for Regular expression NOT Irregular expression

You can use this code to retrieve it using HtmlAgilityPack

HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(html);

var content= doc.DocumentNode
                .SelectSingleNode("//meta[@name='Generator']")
                .Attributes["content"].Value;