如何用正则表达式进行这样的替换
对于 "abk{fdafdljkla;kjke}fdafdafdasf "如何替换成

"abk{{}fdafdljkla;kjke{}}fdafdafdasf "


就是对于{，替换成{{},   对于}，替换成{}}。用正则如何做？

------解决方案--------------------
try

string yourStr = "abk{fdafdljkla;kjke}fdafdafdasf ";
string resultStr = Regex.Replace(yourStr, @ "\{|\} ", new MatchEvaluator(expReplace));


private string expReplace(Match m)
{
return m.Value == "{ " ? m.Value.Replace( "{ ", "{{} ") : m.Value.Replace( "} ", "{}} ");
}