请问正则表达式

请教正则表达式
要求是匹配不在括号内的字符
比如source="12ab(34cd)56e(fg78)h"
要匹配的result="abeh"


[解决办法]
分两步，第一去掉括号中的内容，第二匹配特定字符。

C# code

string source = "12ab(34cd)56e(fg78)h";source = Regex.Replace(source, @"(\([^\)]*\))", "");foreach (Match vMatch in Regex.Matches(source, "[a-z]")){    Console.WriteLine(vMatch.Value);}
[解决办法]

(?<T1>[^\(\)]*)(?:(?=\()|(?<=\)))(?<T2>[^\(\)]*)
Class中再动态的加入自己的匹配字符
[解决办法]
C# code
(?<!\([^\)]*?)[a-z]+
[解决办法]
(?<Result>\w*)([\(]\w*[\)])*
string source = txtSource.Text;
           MatchCollection mc = null;
           Regex re = null;
           re = new Regex(@"(?<Result>\w*)([\(]\w*[\)])*", RegexOptions.IgnoreCase);
           mc = re.Matches(source);
           string r = String.Empty;
           foreach (Match m in mc)
           {
               r += m.Groups["Numbers"].Value;
           }
           txtResult.Text = r;
直接测试就可以了