求一个嵌套的正则表达式

Question

HTML代码如下<div>{ id="a" /}</div>
<div>{ id="{ id="c" /}" /}</div>
我需要依次匹配{ id="a" /}、{ id="c" /}、{ id="{ id="c" /}" /}，当有嵌套的情况时，需从里到外匹配，匹配成功时可将内容替换成别的字符。不知道表达得清不清楚，望各位不吝赐教~

Answer 1

{((?<o>{)|(?<-o>})|.)*?(?(o)(?!))}

Answer 2

递归方法
private void getNesting(string src, Regex reg, List<string> list)
            {                MatchCollection mc = reg.Matches(src);                foreach (Match m in mc)
                {                    list.Add(m.Value);                    src = m.Value.Remove(m.Value.Length - 1, 1);                    if (reg.IsMatch(src))
                    {                        getNesting(src, reg, list);                    }                }            }string tempStr = File.ReadAllText(@"C:\Documents and Settings\Administrator\桌面\Test.txt", Encoding.GetEncoding("GB2312"));//读取txt
                string pattern = @"\{((?<Open>\{)|(?<-Open>\})|[\s\S])*?(?(Open)(?!))\}";
                Regex reg = new Regex(pattern);
                List<string> list = new List<string>();
                getNesting(tempStr, reg, list);
                /*
                 *  [0] "{ id=\"a\" /}" string
                [1] "{ id=\"{ id=\"c\" /}\" /}" string
                [2] "{ id=\"{ id=\"c\" /}" string                 */

Answer 3

谢谢两位的解答，表达式好像还是有点问题，我测试字符串“<div>{ id='a' /}</div><div>{ id='{ id='c' }' /}</div>” 得到的三个结果是
1：{ id='a' /} 
2：{ id='{ id='c' }' /} 
3：{ id='{ id='c' }
第3个不对，应该是{ id='c'};

Answer 4

string pattern = @"(?i)\{(?>[^{}]+|\{(?<o>)|\}(?<-o>))*(?(o)(?!))\}";