using System;
using System.Text;
using System.Text.RegularExpressions;
namespace My.Utils
{
/// <summary>
/// 字符串通用工具
/// </summary>
public class StringUtils
{
/// <summary>
/// 随机生成字符串源
/// </summary>
public const string RANDOM_STRING_SOURCE = "0123456789abcdefghijklmnopqrstuvwxyz";
public StringUtils()
{
}
/// <summary>
/// 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>
/// <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);
}
/// <summary>
/// 替换字符串,不区分大小写
/// </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>
/// <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);
}
/// <summary>
/// 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);
}
/// <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>
/// 生成随机字符串
/// </summary>
/// <param name="num">字符串的位数</param>
/// <returns>可插入数据库的字符串</returns>
public static string GetRandomString (int num)
{
string rndStr="";
Random rnd=new Random();
for (int i=0;i<num;i++)
{
rndStr += RANDOM_STRING_SOURCE.Substring(Convert.ToInt32(Math.Round(rnd.NextDouble()*36,0)),1);
}
return rndStr;
}
/// <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+$");
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("\r\n", "<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 Str
