// From: https://docs.microsoft.com/en-us/dotnet/api/system.text.regularexpressions.regex?view=netframework-4.7.2
// Simple example taken from above URL, and heavily adapted to use list of cities from Wikipedia

using System;
using System.Text.RegularExpressions;

public class Test
{
    public static void Main ()
    {

        // Define a regular expression
        Regex rx1 = new Regex(@"^[0-9]+\s+([A-Za-z]*).*$",
          RegexOptions.Compiled);

	// test string to match against
	string text = @"2 	Edinburgh 	464,990 	City 	City of Edinburgh";

	// Find single match 
        Match match1 = rx1.Match(text);

	// check and print
	if (match1.Success) {
	  Console.WriteLine("First group '{0}' in matched sub-string '{1}' found in single line:\n{2}",
			    match1.Groups[1], match1.Value, text);
	} else {
	  Console.WriteLine("No match found in lines: {0}", text);
	}
	
        // Define a regular expression
        Regex rx = new Regex(@"[0-9]+\s+([A-Za-z]*).*\n",
          RegexOptions.Compiled);

        // Define a test string.        
        string texts = @"Rank 	Locality 	Population 	Status 	Council area
1 	Glasgow 	599,650 	City 	Glasgow City
2 	Edinburgh 	464,990 	City 	City of Edinburgh
3 	Aberdeen 	196,670 	City 	Aberdeen City
4 	Dundee 		147,710 	City 	Dundee City
5 	Paisley 	76,220 		Town 	Renfrewshire
6 	East Kilbride 	74,740 		Town 	South Lanarkshire";

	//Console.WriteLine("Multi-line string to match against:\n{0}", texts);
	
        // Find matches.
        MatchCollection matches = rx.Matches(texts);

        // Report the number of matches found.
        Console.WriteLine("{0} matches found in:\n   {1}", 
                          matches.Count, 
                          texts);

        // Report on each match.
        foreach (Match match in matches) {
	  GroupCollection groups = match.Groups;
          Console.WriteLine("Found city name '{0}' in line\n{1}",
			    groups[1], match.Value);
        }
        
    }
	
}