using System;
using System.Text.RegularExpressions;
 
public class Test
{
	public static void Main()
	{
 
 
String input = @"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]]]";
 
Regex rgx = new Regex(@"(?i)->\s*\[Task\s*id=(\d+)");
 
foreach (Match m in rgx.Matches(input))
         Console.WriteLine(m.Groups[1].Value);
 
	}
}

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