asp.net 正则替换html标签与删除指定字符方法

asp教程.net 正则替换html标签与删除指定字符方法,使用了正则表达式进行规则过滤，由于html标记都是基于<>这种格式，而且还有类似 这样的符号，所以分了2次处理将字符串处理为无html格式的字符串。

public string NoHtml(string html)

{

string StrNohtml = System.Text.RegularExpressions.Regex.Replace(html, "<[^>]+>", "");

StrNohtml = System.Text.RegularExpressions.Regex.Replace(StrNohtml, "&[^;]+;", "");

return StrNohtml;

}

功能增强代码：

public string NoHTML(string Htmlstring) //替换HTML标记

{

//删除脚本

Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase);

//删除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;

}

替换字符串,正则替换字符串,不区分大小写替换字符串,替换html标签,正则匹配

using System;

using System.Text;

using System.Text.RegularExpressions;

namespace EC

{

/// <summary>

/// 替换字符串

/// </summary>

public class StringRepStrs

{

public StringRepStrs ()

{

}

#region 普通替换字符串

/// <summary>

/// 普通替换字符串

/// </summary>

/// <param name="src">源字符串</param>

/// <param name="pattern">要匹配的正则表达式模式</param>

/// <param name="replacement">替换字符串</param>

/// <returns>已修改的字符串</returns>

public static string Replace (string src, string pattern, string replacement)

{

return Replace(src, pattern, replacement, RegexOptions.None);

}

#endregion

#region 正则替换字符串

/// <summary>

/// 正则替换字符串

/// </summary>

/// <param name="src">要修改的字符串</param>

/// <param name="pattern">要匹配的正则表达式模式</param>

/// <param name="replacement">替换字符串</param>

/// <param name="options">匹配模式</param>

/// <returns>已修改的字符串</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 不区分大小写替换字符串

/// <summary>

/// 不区分大小写替换字符串

/// </summary>

/// <param name="src">源字符串</param>

/// <param name="pattern">要匹配的正则表达式模式</param>

/// <param name="replacement">替换字符串</param>

/// <returns>已修改的字符串</returns>

public static string ReplaceIgnoreCase (string src, string pattern, string replacement)

{

return Replace(src, pattern, replacement, RegexOptions.IgnoreCase);

}

#endregion

/// <summary>

/// 删除字符串中指定的内容

/// </summary>

/// <param name="src">要修改的字符串</param>

/// <param name="pattern">要删除的正则表达式模式</param>

/// <returns>已删除指定内容的字符串</returns>

public static string Drop (string src, string pattern)

{

return Replace(src, pattern, "");

}

/// <summary>

/// 删除字符串中指定的内容,不区分大小写

/// </summary>

/// <param name="src">要修改的字符串</param>

/// <param name="pattern">要删除的正则表达式模式</param>

/// <returns>已删除指定内容的字符串</returns>

public static string DropIgnoreCase (string src, string pattern)

{

return ReplaceIgnoreCase(src, pattern, "");

}

/// <summary>

/// 替换字符串到数据库教程可输入模式

/// </summary>

/// <param name="src">待插入数据库的字符串</param>

/// <returns>可插入数据库的字符串</returns>

public static string ToSQL (string src)

{

if (src == null)

{

return null;

}

return Replace(src, "", "");

}

/// <summary>

/// 去掉html内容中的指定的html标签

/// </summary>

/// <param name="content">html内容</param>

/// <param name="tagName">html标签</param>

/// <returns>去掉标签的内容</returns>

public static string DropHtmlTag (string content, string tagName)

{

//去掉<tagname>和</tagname>

return DropIgnoreCase(content, "<[/]{0,1}" + tagName + "[^>]*>");

}

/// <summary>

/// 去掉html内容中全部标签

/// </summary>

/// <param name="content">html内容</param>

/// <returns>去掉html标签的内容</returns>

public static string DropHtmlTag (string content)

{

//去掉<*>

return Drop(content, "<[^>]*>");

}

/// <summary>

/// 判断一个数据是不是数字

/// </summary>

/// <param name="inputData">字符串</param>

/// <returns>结果</returns>

public static bool IsNumeric(string inputData)

{

Regex _isNumber = new Regex(@"^d+{$article$}quot;);

Match m = _isNumber.Match(inputData);

return m.Success;

}

/// <summary>

/// 转换html标签为web页可见内容

/// </summary>

/// <param name="src"></param>

/// <returns></returns>

public static string EscapeHtml (string src)

{

if (src == null)

{

return null;

}

string s = src;

s = Replace(s, ">", ">");

s = Replace(s, "<", "<");

return s;

}

/// <summary>

/// 将字符串格式化成HTML代码

/// </summary>

/// <param name="str">要格式化的字符串</param>

/// <returns>格式化后的字符串</returns>

public static String ToHtml(string str)

{

if (str == null || str.Equals(""))

{

return str;

}

StringBuilder sb= new StringBuilder(str);

sb.Replace("&", "&");

sb.Replace("<", "<");

sb.Replace(">", ">");

sb.Replace("rn", "<br>");

sb.Replace("n", "<br>");

sb.Replace("t", " ");

sb.Replace(" ", " ");

return sb.ToString();

}

/// <summary>

/// 将HTML代码转化成文本格式

/// </summary>

/// <param name="str">要格式化的字符串</param>

/// <returns>格式化后的字符串</returns>

public static String ToTxt(String str)

{

if (str == null || str.Equals(""))

{

return str;

}

StringBuilder sb= new StringBuilder(str);

sb.Replace(" ", " ");

sb.Replace("<br>", "rn");

sb.Replace("<", "<");

sb.Replace(">", ">");

sb.Replace("&", "&");

return sb.ToString();

}

}

}