求正则匹配

C# code

string title1 = "啊啊啊啊啊Q3";string title2 = "啊啊啊啊啊1006";

C# code

string title3 = "Q3";string title4 = "1006";

C# code

Regex reg = new Regex(@"(?is)[a-z0-9]+");
[解决办法]
"[^\u4e00-\u9fa5]+"