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【Asp.Net】 asp.net 替换字符串
作者:Dezai.CN / 发布于2011/9/14/ 695
<div>
using System;
using System.Text;
using System.Text.RegularExpressions<font color="#cc0000">;//这个一定要加</font>
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, ">", "&gt;");
s = Replace(s, "<", "&lt;");
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("&", "&amp;");
sb.Replace("<", "&lt;");
sb.Replace(">", "&gt;");
sb.Replace("\r\n", "");
sb.Replace("\n", "");
sb.Replace("\t", " ");
sb.Replace(" ", "&nbsp;");
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("&nbsp;", " ");
sb.Replace("", "\r\n");
sb.Replace("&lt;", "<");
sb.Replace("&gt;", ">");
sb.Replace("&amp;", "&");
return sb.ToString();
}
}
}
</div>
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