HTML Agility包和字符串解析?

时间:2013-01-08 08:05:07

标签: c# html-agility-pack

我有这样的html字符串(yahoo xml description element)

<img src="http://l.yimg.com/a/i/us/we/52/26.gif"/><br /> 
<b>Current Conditions:</b><br /> Cloudy, 1 C<BR /> <BR />
<b>Forecast:</b><BR /> Mon - Snow. High: -5 Low: -14<br /> Tue - Light Snow. High: -8 Low: -16<br /> <br /> 
....

我想只获得高值和低值(例如:-5,-14,-8,-16)

我试着像这样使用htmlAgilityPack:

HtmlDocument htmlDoc = new HtmlDocument();
htmlDoc.LoadHtml(rssDescriptionElement);
List<string> elements = new List<string>();

foreach (HtmlNode element in htmlDoc.DocumentNode.SelectNodes("//br"))
{
    elements.Add(element.NextSibling.InnerText);
}
上面的htmlString的

elements列表输出:

"\n"
"\nCloudy, 1 C"
"\n"
"Forecast:"
"\nMon - Snow. High: -5 Low: -14"
"\nTue - Light Snow. High: -8 Low: -16"
"\n"
"\n"
""
"\n(provided by "
"\n"

如何从此列表中获取高值和低值(-5,-14,-8,-16)或另一种不同的解决方案?

1 个答案:

答案 0 :(得分:1)

使用正则表达式:

(?:High|Low)\s*:\s*(?<num>-?\d+)

并获取名为num的组。示例代码:

List<string> elements = new List<string>();
var pattern = @"(?:High|Low)\s*:\s*(?<num>-?\d+)";

foreach (HtmlNode element in htmlDoc.DocumentNode.SelectNodes("//br"))
{
    foreach(Match mc in Regex.Matches(element.NextSibling.InnerText, pattern))
    {
        elements.Add(mc.Groups["num"].ToString());
    }
}