Question

C# 正则表达式使用方法

string a="aaa123123"
Console.WriteLine 打印数字.

Answer 1

public static void Main() {
string value = "aaa123123";

var intQuery = from v in value
where v >= 48 && v <= 57
select v;

foreach (var i in intQuery)
Console.WriteLine(i);
}

Answer 2

Regex r = new Regex("\d+");

Answer 3

a.replace(a,"");//用空格代替a
Console.WriteLine (a). //输出123123
这个方法最简单
replace是正则表达式的方法

还可以用 substring方法
或者 正则符号

Answer 4

Regex reg = new Regex(@"(\d+)");
Console.WriteLine(reg.Replace("aaa123123","$1"));