asp.net 正則替換html標籤與刪除指定字元方法

asp教程.net 正則替換html標籤與刪除指定字元方法,使用了Regex進行規則過濾，由於html標記都是基於<>這種格式，而且還有類似&nbsp;這樣的符號，所以分了2次處理將字串處理為無html格式的字串。

 

public string NoHtml(string html)
{
    string StrNohtml = System.Text.RegularExpressions.Regex.Replace(html, "<[^>]+>", "");
    StrNohtml = System.Text.RegularExpressions.Regex.Replace(StrNohtml, "&[^;]+;", "");
    return StrNohtml;
}

 

功能增強代碼：

 

 

public string NoHTML(string Htmlstring)  //替換HTML標記
{
    //刪除指令碼
    Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);

    //刪除HTML
    Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"([rn])[s]+", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", """, RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", " ", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "xa1", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "xa2", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "xa3", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "xa9", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"&#(d+);", "", RegexOptions.IgnoreCase);
    Htmlstring = Regex.Replace(Htmlstring, @"<img[^>]*>;", "", RegexOptions.IgnoreCase);
    Htmlstring.Replace("<", "");
    Htmlstring.Replace(">", "");
    Htmlstring.Replace("rn", "");
    Htmlstring = HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim();
    return Htmlstring;
}

替換字串,正則替換字串,不區分大小寫替換字串,替換html標籤,正則匹配

 

using System;
using System.Text;
using System.Text.RegularExpressions;

namespace EC
{
 /// <summary>
 /// 替換字串
 /// </summary>
 public class StringRepStrs
 {

 

  public StringRepStrs ()
  {
  }

 #region  普通替換字串

  /// <summary>
  ///  普通替換字串

  /// </summary>
  /// <param name="src">源字串</param>
  /// <param name="pattern">要匹配的Regex模式</param>
  /// <param name="replacement">替換字串</param>
  /// <returns>已修改的字串</returns>
  public static string Replace (string src, string pattern, string replacement)
  {
   return Replace(src, pattern, replacement, RegexOptions.None);
  }

 #endregion

#region 正則替換字串

  /// <summary>
  ///  正則替換字串

  /// </summary>
  /// <param name="src">要修改的字串</param>
  /// <param name="pattern">要匹配的Regex模式</param>
  /// <param name="replacement">替換字串</param>
  /// <param name="options">匹配模式</param>
  /// <returns>已修改的字串</returns>
  public static string Replace (string src, string pattern, string replacement, RegexOptions options)
  {
   Regex regex = new Regex(pattern, options|RegexOptions.Compiled);

   return regex.Replace(src, replacement);
  }

#endregion

#region 不區分大小寫替換字串

  /// <summary>
  /// 不區分大小寫替換字串

  /// </summary>
  /// <param name="src">源字串</param>
  /// <param name="pattern">要匹配的Regex模式</param>
  /// <param name="replacement">替換字串</param>
  /// <returns>已修改的字串</returns>
  public static string ReplaceIgnoreCase (string src, string pattern, string replacement)
  {
   return Replace(src, pattern, replacement, RegexOptions.IgnoreCase);
  }

#endregion

 

  /// <summary>
  /// 刪除字串中指定的內容
  /// </summary>
  /// <param name="src">要修改的字串</param>
  /// <param name="pattern">要刪除的Regex模式</param>
  /// <returns>已刪除指定內容的字串</returns>
  public static string Drop (string src, string pattern)
  {
   return Replace(src, pattern, "");
  }
 

  /// <summary>
  /// 刪除字串中指定的內容,不區分大小寫
  /// </summary>
  /// <param name="src">要修改的字串</param>
  /// <param name="pattern">要刪除的Regex模式</param>
  /// <returns>已刪除指定內容的字串</returns>
  public static string DropIgnoreCase (string src, string pattern)
  {
   return ReplaceIgnoreCase(src, pattern, "");
  }

  /// <summary>
  /// 替換字串到資料庫教程可輸入模式
  /// </summary>
  /// <param name="src">待插入資料庫的字串</param>
  /// <returns>可插入資料庫的字串</returns>
  public static string ToSQL (string src)
  {
   if (src == null)
   {
    return null;
   }
   return Replace(src, "", "");
  }

  /// <summary>
  /// 去掉html內容中的指定的html標籤
  /// </summary>
  /// <param name="content">html內容</param>
  /// <param name="tagName">html標籤</param>
  /// <returns>去掉標籤的內容</returns>
  public static string DropHtmlTag (string content, string tagName)
  {
   //去掉<tagname>和</tagname>
   return DropIgnoreCase(content, "<[/]{0,1}" + tagName + "[^>]*>");
  }

  /// <summary>
  /// 去掉html內容中全部標籤
  /// </summary>
  /// <param name="content">html內容</param>
  /// <returns>去掉html標籤的內容</returns>
  public static string DropHtmlTag (string content)
  {
   //去掉<*>
   return Drop(content, "<[^>]*>");
  }

    /// <summary>
  /// 判斷一個資料是不是數字
  /// </summary>
  /// <param name="inputData">字串</param>
  /// <returns>結果</returns>
  public static bool IsNumeric(string inputData)
  {
   Regex _isNumber = new Regex(@"^d+{$article$}quot;);
   Match m = _isNumber.Match(inputData);
   return m.Success;
  }

  /// <summary>
  /// 轉換html標籤為web頁可見內容
  /// </summary>
  /// <param name="src"></param>
  /// <returns></returns>
  public static string EscapeHtml (string src)
  {
   if (src == null)
   {
    return null;
   }
   string s = src;
   s = Replace(s, ">", "&gt;");
   s = Replace(s, "<", "&lt;");
   return s;
  }

  /// <summary>
  /// 將字串格式化成HTML代碼
  /// </summary>
  /// <param name="str">要格式化的字串</param>
  /// <returns>格式化後的字串</returns>
  public static String ToHtml(string str)
  {
   if (str == null || str.Equals(""))
   {
    return str;
   }
           
   StringBuilder sb= new StringBuilder(str);
   sb.Replace("&", "&amp;");
   sb.Replace("<", "&lt;");
   sb.Replace(">", "&gt;");
   sb.Replace("rn", "<br>");
   sb.Replace("n", "<br>");
   sb.Replace("t", " ");
   sb.Replace(" ", "&nbsp;");
   return sb.ToString();
  }

  /// <summary>
  /// 將HTML代碼轉化成文字格式設定
  /// </summary>
  /// <param name="str">要格式化的字串</param>
  /// <returns>格式化後的字串</returns>
  public static String ToTxt(String str)
  {
   if (str == null || str.Equals(""))
   {
    return str;
   }
           
   StringBuilder sb= new StringBuilder(str);
   sb.Replace("&nbsp;", " ");
   sb.Replace("<br>", "rn");
   sb.Replace("&lt;", "<");
   sb.Replace("&gt;", ">");
   sb.Replace("&amp;", "&");
   return sb.ToString();
  }
 }
}