正文抽取所需正则全集 .
在正文抽取（正文提取）里一般会用到的正则，易尔译科技收集了一下，是C#版本的正文抽取正则表达式。欢迎大家补充。
#region 相关正则表达式
/// <summary>
/// 去掉所有html标签
/// </summary>
private static readonly Regex FilterAll = new Regex(
@"(\[([^=]*)(=[^\]]*)?\][\s\S]*?\[/\1\])|(?<lj>(?=[^\u4E00-\u9FA5\uFE30-\uFFA0,."");])<a\s+[^>]*>[^<]{2,}</a>(?=[^\u4E00-\u9FA5\uFE30-\uFFA0,."");]))|(?<Style><style[\s\S]+?/style>)|(?<select><select[\s\S]+?/select>)|(?<Script><script[\s\S]*?/script>)|(?<Explein><\!\-\-[\s\S]*?\-\->)|(?<li><li(\s+[^>]+)?>[\s\S]*?/li>)|(?<Html></?\s*[^> ]+(\s*[^=>]+?=['""]?[^""']+?['""]?)*?[^\[<]*>)|(?<Other>&[a-zA-Z]+;)|(?<Other2>\#[a-z0-9]{6})|(?<Space>\s+)|(\&\#\d+\;)",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase); //(?<Link><a[\s\S]*?</a>)|
//(?<Style><style[\s\S]+?/style>)|(?<select><select[\s\S]+?/select>)|(?<Script><script[\s\S]*?/script>)|(?<Explein><\!\-\-[\s\S]*?\-\->)|(?<li><li(\s+[^>]+)?>[\s\S]*?/li>)|(?<Html></?\s*[^> ]+(\s*[^=>]+?=['""]?[^""']+?['""]?)*?[^\[<]*>)|(?<Other>&[a-zA-Z]+;)|(?<Other2>\#[a-z0-9]{6})|(?<Space>\s+)
/// <summary>
/// 找出title标签
/// </summary>
private static readonly Regex FindTitle = new Regex(
@"<\s*/?title\s*>",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
/// <summary>
/// 找出title标签内容
/// </summary>
private static readonly Regex FindTitleContent = new Regex(
@"<\s*/?title\s*>(?<Content>[\s\S]*?)<\s*/?title\s*>",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
/// <summary>
/// 找出h 和Strong标签
/// </summary>
private static readonly Regex FindHStrong = new Regex(
@"<\s*/?h\s*>|<\s*/?strong\s*>",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
/// <summary>
/// 找出p 和br标签
/// </summary>
private static readonly Regex FindPB = new Regex(
@"<\s*/?p\s*>|<\s*br\s*/?>|<\s*/?tr\s*>",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
/// <summary>
/// 找出nbsp标签
/// </summary>
private static readonly Regex FindNbsp = new Regex(
@" ",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
/// <summary>
/// 找出结尾标签
/// </summary>
private static readonly Regex FindS = new Regex(
@"(?<Content>[\s\S]*?)\$",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
/// <summary>
/// 找出是否为标准句
/// </summary>
private static readonly Regex IsSen = new Regex(
@"[,.，。!！;；:：……？?《》“”""]",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
/// <summary>
/// 找出是否为垃圾句[strong][h]标签过多的
/// </summary>
private static readonly Regex IsWs = new Regex(
@"\[\(h\)\]",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
/// <summary>
/// 找出是否为垃圾句冒号和·-过多的
/// </summary>
private static readonly Regex IsWsM = new Regex(
@"\[·]|[－]|[：:]",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
/// <summary>
/// 找出是否为BBS特征
/// </summary>
private static readonly Regex IsBbsInfo = new Regex(
@"第[^楼]{1,50}楼|Powered\s*/?by[\s\S]*?Dvbbs|Powered\s*/?by[\s\S]*?Discuz",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
/// <summary>
/// 取KEYWORD
/// </summary>
private static readonly Regex mKeyWord = new Regex(
@"<meta\s*name\s*=\s*['""]?keywords['""]?\s*content\s*=\s*['""]?(?<KeyWords>[^'"">]*)['""]?[^>]*>|<meta\s*content\s*=\s*['""]?(?<KeyWords>[^'"">]*)['""]?\s*name\s*=\s*['""]?keywords['""]?\s*[^>]*>
",RegexOptions.ExplicitCapture| RegexOptions.Multiline| RegexOptions.IgnoreCase);
/// <summary>
/// 取DESCRIPTION
/// </summary>
private static readonly Regex mDescription = new Regex(
@"<meta\s*name\s*=\s*['""]?description['""]?\s*content\s*=\s*['""]?(?<description>[^'"">]*)['""]?[^>]*>|<meta\s*content\s*=\s*['""]?(?<description>[^'"">]*)['""]?\s*name\s*=\s*['""]?description['""]?\s*[^>]*>
",RegexOptions.ExplicitCapture| RegexOptions.Multiline| RegexOptions.IgnoreCase);
/// <summary>
/// 取Tags
/// </summary>
private static readonly Regex mTag = new Regex(
@"<meta\s*name\s*=\s*['""]?tagwords['""]?\s*content\s*=\s*['""]?(?<tagwords>[^'"">]*)['""]?[^>]*>|<meta\s*content\s*=\s*['""]?(?<tagwords>[^'"">]*)['""]?\s*name\s*=\s*['""]?tagwords['""]?\s*[^>]*>
", RegexOptions.ExplicitCapture | RegexOptions.Multiline | RegexOptions.IgnoreCase);
/// <summary>
/// 找出是否为垃圾句:后字符号过少，：号前无“说”字,:号后无"关于"
/// </summary>
private static readonly Regex IsWsMM = new Regex(
@"^[^说\s]{0,8}?[:：].{0,10}$",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
/// <summary>
/// 找出spider写入的url标记
/// </summary>
private static readonly Regex txtUrl = new Regex(
@"当前URL为:http://(?<URL>.*)",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
/// <summary>
/// 找出spider写入的锚点描述标记
/// </summary>
private static readonly Regex txtDescription = new Regex(
@"当前链接描述为:(?<Describe>.*)",
RegexOptions.ExplicitCapture
| RegexOptions.Multiline
| RegexOptions.IgnoreCase);
///// <summary>
///// 取需要a标签
///// </summary>
//private static readonly Regex cleanFirst = new Regex(
// @"([\u4E00-\u9FA5]|[\uFE30-\uFFA0]|[,."");])(?<Robbish1><a\s+[^>]*>)[^<]{1,6}(?<Robbish2></a>)([\u4E00-\u9FA5]|[\uFE30-\uFFA0]|[,."");])", RegexOptions.ExplicitCapture | RegexOptions.Multiline | RegexOptions.IgnoreCase);
#endregion
