using System;
using System.Linq;
using System.Diagnostics;
using System.Text.RegularExpressions;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
string str = "+123-456/7890";
var onlyNumbers = Convert.ToInt64(Regex.Replace(str, "[^0-9]+", ""));
}
}
}
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