Regex file matching | C# Online Compiler

Regex file matching by ShaunLuttin

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

public class Program
{
	public static void Main()
	{
		List<string> files = new List<string>();
		files.Add("AB_DBER_2016101194814.txt");
		files.Add("AB_EBER_2016101194815.txt");
		files.Add("AB_FBER_2016101194811.txt");
		
		// the following will not match
		files.Add("AB_FBER_20161011948111txt");
		files.Add("This_Does_Not_Match.txt");
		
		List<string> refFiles = new List<string>();
		refFiles.Add(@"AB_DBER_[0-9]{13,13}\.txt");
		refFiles.Add(@"AB_EBER_[0-9]{13,13}\.txt");
		refFiles.Add(@"AB_FBER_[0-9]{13,13}\.txt");
		foreach (var pattern in refFiles)
		{
			var regex = new Regex(pattern);
			foreach (var file in files)
			{
				if (regex.IsMatch(file))
				{
					Console.WriteLine(file);
				}
			}
		}
	}
}

​x
 
using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
​
public class Program
{
    public static void Main()
    {
        List<string> files = new List<string>();
        files.Add("AB_DBER_2016101194814.txt");
        files.Add("AB_EBER_2016101194815.txt");
        files.Add("AB_FBER_2016101194811.txt");
        
        // the following will not match
        files.Add("AB_FBER_20161011948111txt");
        files.Add("This_Does_Not_Match.txt");
        
        List<string> refFiles = new List<string>();
        refFiles.Add(@"AB_DBER_[0-9]{13,13}\.txt");
        refFiles.Add(@"AB_EBER_[0-9]{13,13}\.txt");
        refFiles.Add(@"AB_FBER_[0-9]{13,13}\.txt");
        foreach (var pattern in refFiles)
        {
            var regex = new Regex(pattern);
            foreach (var file in files)
            {
                if (regex.IsMatch(file))
                {
                    Console.WriteLine(file);
                }
            }
        }
    }
}

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Cached Result
Last Run:	8:24:27 am
Compile:	0.009s
Execute:	4.38s
Memory:	7.64Mb
CPU:	4.389s

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