I want to extract contents of title tag from html string. I have done some search but so far i am not able to find such code in VB/C# or PHP. Also this should work with both upper and lower case tags e.g. should work with both <title></title> and <TITLE></TITLE>. Thank you.
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问题:
回答1:
You can use regular expressions for this but it's not completely error-proof. It'll do if you just want something simple though (in PHP):
function get_title($html) {
return preg_match('!<title>(.*?)</title>!i', $html, $matches) ? $matches[1] : '';
}
回答2:
Sounds like a job for a regular expression. This will depend on the HTML being well-formed, i.e., only finds the title element inside a head element.
Regex regex = new Regex( ".*<head>.*<title>(.*)</title>.*</head>.*",
RegexOptions.IgnoreCase );
Match match = regex.Match( html );
string title = match.Groups[0].Value;
I don't have my regex cheat sheet in front of me so it may need a little tweaking. Note that there is also no error checking in the case where no title element exists.
回答3:
If there is any attribute in the title tag (which is unlikely but can happen) you need to update the expression as follows:
$title = preg_match('!<title.*>(.*?)</title>!i', $url_content, $matches) ? $matches[1] : '';
