Try this out:

using UnityEngine;
using System.Collections;
using System.Text.RegularExpressions;

public class regex : MonoBehaviour 
{
    public string s = "afsdlk 10 sdfalkj 30";

    // Update is called once per frame
    void Start()
    {
       string[] numbers = Regex.Split(s, @"\D+");
       foreach (string value in numbers)
       {
         if (!string.IsNullOrEmpty(value))
         {
         int i = int.Parse(value);
         Debug.Log("Number: " + i);
         }
       }
    }
}

I wrote this code by adapting the example from this site: http://www.dotnetperls.com/get-numbers-from-string