using System;
using System.Text;
public class Test
{
public static void Main()
{
string s = "NEW ITEM:1_BELT:3_JEANS:1_BELT:1_SUIT 3 PCS:1_SHOES:1";
var array = s.Split(new char[] { ':' }, StringSplitOptions.RemoveEmptyEntries);
StringBuilder sb = new StringBuilder();
foreach (var item in array)
{
if (Char.IsDigit(item[0]))
{
sb.Append(":" + item[0]);
}
}
Console.WriteLine(sb); //:1:3:1:1:1:1
}
}
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