//同个关键词每次替换不同
public static string ReplaceEveryTimeDifferentWithRegex(this string str, string oldStr, ChangeEveryTimesNewwordDelegate newwordDelegate)
{
string newStr;
while (str.IndexOf(oldStr) > 0)
{
Regex regex = new Regex(oldStr); //要替换字符串
newStr = newwordDelegate();
str = regex.Replace(str, newStr, 1); //最后一个参数是替换的次数
}
return(str);
}
//同个关键词每次替换不同
public static string ReplaceEveryTimeDifferentWithStringBuilder(this string str, string oldStr, ChangeEveryTimesNewwordDelegate newwordDelegate)
{
string newStr;
//Console.WriteLine("将字符串中的{0}替换成{1}···", oldStr, newStr);
StringBuilder strBuffer = new StringBuilder();
int start = 0;
int tail = 0;
//一旦找不到需要替换的字符串(第一次IndexOf返回-1)
//就说明没有该关键字符串，可以直接返回之前的字符串
if (str.IndexOf(oldStr) == -1)
{
//Console.WriteLine("没有找到需要替换的关键字符串!");
return(str);
}
//每次都不断循环，查找这个x
//一旦找到了，就把它之前和上一个x之后的字符串拼接起来
while (true)
{
start = str.IndexOf(oldStr, start);
if (start == -1)
{
break;
}
strBuffer.Append(str.Substring(tail, start - tail));
newStr = newwordDelegate();
strBuffer.Append(newStr);
start += oldStr.Length;
tail = start;
}
//查找到最后一个位置之后
//还要把剩下的字符串拼接进去
strBuffer.Append(str.Substring(tail));
return(strBuffer.ToString());
}