正则表达式截取数据

//截取##之间的内容，检索所有的数据
string a = "select * from yw_020102 where CustomerNo='#CustomerNo#'";
Regex reg = new Regex("(?i)(?<=#)[^a]*(?=#)");//commend by danielinbiti
MatchCollection mc = reg.Matches(a);
foreach (Match m in mc)
{
Console.WriteLine(m.Value);
}
return;