using System;
using System.Text.RegularExpressions;
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 output = Regex.Replace(s, @"[^0-9]+", "");
StringBuilder sb = new StringBuilder();
foreach (var i in output)
{
sb.Append(":" + i);
}
Console.WriteLine(sb); // :1:3:1:1:3:1:1
}
}
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