using System;
using System.Text.RegularExpressions;
 
public class Test {
	public static void Main() {
 
        string[] numbers = {"123_555-0190", "444-234-22450", "690-555-0178", 
                            "146-893-232", "146-555-0122", "4007-555,-0111", 
                            "407-55-0111", "a1b-Cd-EfgH", "a1b-Cd-Efgn",
                            "UM2345678", 
                            "11/12/2013 4:10:06 PM		UM2345678			UM2345678",
                            "407-2-5555"};
 
     foreach (string s in numbers) {
        string a = RemoveSpecialCharacters(s);
        Console.WriteLine(a);
     }
 
	}
 
   public static string RemoveSpecialCharacters(string str) {
        return Regex.Replace(str, "[^a-zA-Z0-9_.,\t-]+", "", RegexOptions.Compiled);
    }
}

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