using System;
    using System.Text.RegularExpressions;
    using System.Collections.Specialized;
    class Program {
    
    static void Main() {
    string s1 = @"Task Predecessors:[[Relation [Task id=12 uniqueID=145 name=Alibaba1] -> [Task id=10 uniqueID=143 name=Alibaba2]], [Relation [Task id=12 uniqueID=145 name=Alibaba3] -> [Task id=11 uniqueID=144 name=Alibaba4]], [Relation [Task id=12 uniqueID=145 name=Alibaba5] -> [Task id=9 uniqueID=142 name=Alibaba6]]]";
    var resultList = new StringCollection();
    try {
    	var myRegex = new Regex(@"-> \[Task id=(\d+)");
    	Match matchResult = myRegex.Match(s1);
    	while (matchResult.Success) {
    		resultList.Add(matchResult.Groups[1].Value);
    		Console.WriteLine(matchResult.Groups[1].Value);
    		matchResult = matchResult.NextMatch();
    	} 
    } catch (ArgumentException ex) {
    	// Syntax error in the regular expression
    }
    
    Console.WriteLine("\nPress Any Key to Exit.");
    Console.ReadKey();
    } // END Main
    } // END Program