출처1 :

HTMLTags.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Text.RegularExpressions;

/*

* 출처 :

* http://acidluna.tistory.com/224

* http://blog.naver.com/csaiur/10083194327

*/

class HTMLTags

{

/// <summary>

/// HTML Tag 모두 제거

/// </summary>

/// <param name="str">HTML</param>

/// <returns></returns>

public static string StripHTMLTags(string str)

{

return Regex.Replace(str, @"<(.|\n)*?>", String.Empty);

}

/// <summary>

/// 허용한 HTML Tag를 제외하고 모두 제거

/// </summary>

/// <param name="str">HTML</param>

/// <param name="strAllowTag">ex) b,span,div</param>

/// <param name="option">ex) h:header, c:comment, s:style, r:SpecialString</param>

/// <returns></returns>

public static string StripHTMLTags(string str, string strAllowTag, string option)

{

//헤더제거

if (option.ToLower().Contains('h'))

str = RemoveHeaderTitle(str);

//주석제거

if (option.ToLower().Contains('c'))

str = RemoveComment(str);

//style tag 제거

if (option.ToLower().Contains('s'))

str = Regex.Replace(str, @"style=['|""].*?['|""]", string.Empty);

string acceptable = string.Empty;

string[] AllowTags = strAllowTag.Split(',');

foreach (string tag in AllowTags)

{

if (string.IsNullOrEmpty(acceptable))

acceptable = string.Format("{0}[\x20/>]|{1}[\x20/>]", tag.ToLower().Trim(), tag.ToUpper().Trim());

else

acceptable += string.Format("|{0}[\x20/>]|{1}[\x20/>]", tag.ToLower().Trim(), tag.ToUpper().Trim());

}

string stringPattern = @"</?(?(?=" + acceptable + @")notag|[a-zA-Z0-9]+)(?:\s[a-zA-Z0-9\-]+=?(?:(["",']?).*?\1?)?)*\s*/?>";

string removeTag = Regex.Replace(str, stringPattern, string.Empty);

if (option.ToLower().Contains('r'))

removeTag = ReplaceSpecialString(removeTag);

return removeTag;

}

/// <summary>

/// Href 부분의 링크만 가져오기

/// </summary>

/// <param name="aTag">Href가 들어있는 a Tag</param>

/// <returns></returns>

public static string GetAtagLink(string aTag)

{

var regex = new Regex(@"[Hh][Rr][Ee][Ff]=['|""](.*?)['|""]");

var match = regex.Match(aTag);

return match.Groups[1].Value;

}

/// <summary>

/// Document Type, Title 제거

/// </summary>

/// <param name="str"></param>

/// <returns></returns>

private static string RemoveHeaderTitle(string str)

{

str = Regex.Replace(str, @"<!DOCTYPE.*?>", string.Empty);

str = Regex.Replace(str, @"\<([Tt][Ii][Tt][Ll][Ee])\>.*?\<\/\1\>", string.Empty);

return str;

}

/// <summary>

/// HTML 주석 제거

/// </summary>

/// <param name="str">HTML</param>

/// <returns></returns>

public static string RemoveComment(string str)

{

//http://stackoverflow.com/questions/3524317/regex-to-strip-line-comments-from-c-sharp/3524689#3524689

return Regex.Replace(str, "", string.Empty, RegexOptions.Singleline);

}

/// <summary>

/// HTML Tag를 모두 특수문자 인코딩으로 치환

/// </summary>

/// <param name="str">HTML</param>

/// <returns></returns>

public static string HTMLEncode(string str)

{

return System.Web.HttpContext.Current.Server.HtmlEncode(str);

}

/// <summary>

/// <,>를 <,>로 모두 치환

/// </summary>

/// <param name="str">HTML</param>

/// <returns></returns>

public static string ReplaceHTMLSpecialChars(string str)

{

return Regex.Replace(str, @"<([^<>]+)?>", "<$1>");

}

/// <summary>

/// 허용한 HTML 태그를 제외하고 <,>를 <,>로 치환

/// </summary>

/// <param name="str">HTML</param>

/// <param name="strAllowTag">ex) b,span,div</param>

/// <returns></returns>

public static string ReplaceHTMLSpecialChars(string str, string strAllowTag)

{

string pattern = @"<(\/?)(?!\/####)([^<|>]+)?>";

string substitute = "<$1$2>";

string[] allowTags = strAllowTag.Split(',');

StringBuilder buffer = new StringBuilder();

for (int i = 0; i < allowTags.Length; i++)

{

buffer.Append("|" + allowTags[i].Trim() + @"(?!\w)");

}

pattern = pattern.Replace("####", buffer.ToString());

return Regex.Replace(str, pattern, substitute);

}

/// <summary>

/// 특수문자 변경

/// </summary>

/// <param name="str">String</param>

/// <returns></returns>

private static string ReplaceSpecialString(string str)

{

Dictionary<string, string> dicSpStr = new Dictionary<string, string>

{

{" ", " "}

,{"<", "<"}

,{">", ">"}

,{"&", "&"}

,{""", "\""}

,{"‘", "'"}

,{"’", "'"}

,{"·", "·"}

,{"․", "·"}

};

foreach (KeyValuePair<string, string> spStr in dicSpStr)

{

str = str.Replace(spStr.Key, spStr.Value);

}

return str;

}

}

[C#, Csharp] Code Behind, HTML Tag 제거 치환 HTML Tags Replace Remove 정규식