c#中过滤html的正则表达式
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2023-11-17 18:59:52
实现代码
///
/// 去除html标记
///
///
实现代码
/// <summary>
/// 去除html标记
/// </summary>
/// <param name=”nohtml”>包括html的源码 </param>
/// <returns>已经去除后的文字</returns>
public static string nohtml(string htmlstring)
{
//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, @"([\r\n])[\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.replace("<", "");
htmlstring.replace(">", "");
htmlstring.replace("\r\n", "");
htmlstring = httpcontext.current.server.htmlencode(htmlstring).trim();
return htmlstring;
}
c#过滤html标签及空格
public static string filterhtml(string htmlstr)
{
if (!string.isnullorempty(htmlstr))
return system.text.regularexpressions.regex.replace(htmlstr, "<[^>]*>| ", "");
else
return "";
}
写一个静态方法移除html标签
#region
/// <summary>
/// 移除html标签
/// </summary>
/// <param name="htmlstr">htmlstr</param>
public static string parsetags(string htmlstr)
{
return system.text.regularexpressions.regex.replace(htmlstr, "<[^>]*>", "");
}
#endregion
取出文本中的图片地址
#region
/// <summary>
/// 取出文本中的图片地址
/// </summary>
/// <param name="htmlstr">htmlstr</param>
public static string getimgurl(string htmlstr)
{
string str = string.empty;
string spattern = @"^<img\s+[^>]*>";
regex r = new regex(@"<img\s+[^>]*\s*src\s*=\s*([']?)(?<url>\s+)'?[^>]*>",
regexoptions.compiled);
match m = r.match(htmlstr.tolower());
if (m.success)
str = m.result("${url}");
return str;
}
#endregion
提取html代码中文字的c#函数
/// <summary>
/// 提取html代码中文字的c#函数
/// </summary>
/// <param name="strhtml">包括html的源码 </param>
/// <returns>已经去除后的文字</returns>
using system;
using system.text.regularexpressions;
public class striphtmltest
{
public static void main()
{
string s = striphtml(
"<html><head><title>中国石龙信息平台</title></head><body>faddfs龙信息平台</body></html>");
console.writeline(s);
}
public static string striphtml(string strhtml)
{
string[]aryreg =
{
@"<script[^>]*?>.*?</script>",
@"<(\/\s*)?!?((\w+:)?\w+)(\w+(\s*=?\s*(([""'])(\\["
"'tbnr]|[^\7])*?\7|\w+)|.{0})|\s)*?(\/\s*)?>", @"([\r\n])[\s]+", @
"&(quot|#34);", @"&(amp|#38);", @"&(lt|#60);", @"&(gt|#62);", @
"&(nbsp|#160);", @"&(iexcl|#161);", @"&(cent|#162);", @"&(pound|#163);",
@"&(copy|#169);", @"(\d+);", @"-->", @"<!--.*\n"
};
string[]aryrep =
{
"", "", "", "\"", "&", "<", ">", " ", "\xa1", //chr(161),
"\xa2", //chr(162),
"\xa3", //chr(163),
"\xa9", //chr(169),
"", "\r\n", ""
};
string newreg = aryreg[0];
string stroutput = strhtml;
for (int i = 0; i < aryreg.length; i++)
{
regex regex = new regex(aryreg[i], regexoptions.ignorecase);
stroutput = regex.replace(stroutput, aryrep[i]);
}
stroutput.replace("<", "");
stroutput.replace(">", "");
stroutput.replace("\r\n", "");
return stroutput;
}
}
tempcontent 表示包含有html的字符串；
tempcontent = system.text.regularexpressions.regex.replace(tempcontent,"<[^>]+>","");至少一个
tempcontent = system.text.regularexpressions.regex.replace(tempcontent,"<[^>]*>","");任意个
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