C# Online Compiler | .NET Fiddle

<no name> by Anonymous

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

					
public class Program
{
	public static void Main()
    {
		var text = "1POB1677";
Console.WriteLine( Regex.IsMatch(text, "^[0-9]+[A-Z]{0,3}[0-9]+$") && text.Length > 4);
		
		Console.WriteLine( Regex.IsMatch(text, "^[0-9]+$"));

		
		
		
		
		
	}
}

​x
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Globalization;
using System;
using System.Web;
using System.IO;using System.Text.RegularExpressions;
​
                    
public class Program
{
    public static void Main()
    {
        var text = "1POB1677";
Console.WriteLine( Regex.IsMatch(text, "^[0-9]+[A-Z]{0,3}[0-9]+$") && text.Length > 4);
        
        Console.WriteLine( Regex.IsMatch(text, "^[0-9]+$"));
​
        
        
        
        
        
    }
}

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Cached Result
Last Run:	12:16:29 am
Compile:	0.186s
Execute:	0s
Memory:	80.05kb
CPU:	0s

View IL Code