using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;

public class Test
{
	public static void Main()
	{
		var texts = new List<string> { "Paybacks: blah","Paybacks:blah","Paybacks blah"};
		var pattern = new Regex(@"Paybacks[\s:]*(.*)", RegexOptions.IgnoreCase);
    	texts.ForEach(text => Console.WriteLine(pattern.Match(text)?.Groups[1].Value));
	}
}