using System;

using System.Text.RegularExpressions;

​

public class Program

{

    private static readonly Regex _regex = new Regex(@"(?<Line>.*) \((?<City>.*)\) Water Network Pumping");

    public static void Main()

    {

        var regExpressions = new[]{

            new Regex(@"(?<Line>.*) \((?<City>.*)\) Water Network Pumping"), 

            new Regex(@"(?<Line>.*)( \((?<City>.*)\))? Water Network Pumping"), 

        };

        foreach (var regex in regExpressions)

        {

            Console.WriteLine(regex.ToString());

            CheckRegex(@"Abingdon Road (Oxford) Water Network Pumping", regex);

            CheckRegex(@"Adderbury Water Network Pumpingg", regex);

            Console.WriteLine();

        }

    }

​

    private static void CheckRegex(string value, Regex regex)

    {

        var groups = regex.Match(value).Groups;

        foreach (string groupName in regex.GetGroupNames())

        {

            Console.WriteLine("Group: {0}, Value: {1}", groupName, groups[groupName].Value);

        }

​

        Console.WriteLine();

    }

}