http://pt.stackoverflow.com/questions/142932/verificar-se-string-inicia-com-numero/142937#142937 | C# Online Compiler

http://pt.stackoverflow.com/questions/142932/verificar-se-string-inicia-com-numero/142937#142937 by Cigano Morrison Mendez

using System;
using System.Text.RegularExpressions;
					
public class Program
{
	public static bool IsNumber(string str)
	{
    	return new Regex(@"^[0-9]+").IsMatch(str);
	}
	
	public static void Main()
	{
		Console.WriteLine(IsNumber("123"));
		Console.WriteLine(IsNumber("abc"));
		Console.WriteLine(IsNumber("1abc"));
		Console.WriteLine(IsNumber("a123"));
	}
}

 
using System;
using System.Text.RegularExpressions;
                    
public class Program
{
    public static bool IsNumber(string str)
    {
        return new Regex(@"^[0-9]+").IsMatch(str);
    }
    
    public static void Main()
    {
        Console.WriteLine(IsNumber("123"));
        Console.WriteLine(IsNumber("abc"));
        Console.WriteLine(IsNumber("1abc"));
        Console.WriteLine(IsNumber("a123"));
    }
}

z found: 0.8511239862970292
y found: 0.2868760137029707
x1 found: 53.851123986297026
x2 found: 53.28687601370297
misecret1 found: 16248138789336150
misecret2 found: 10988743985327536
hexadecimalValue found: 39B9989CCCB456
privateKeyHex found: 0000000000000000000000000000000000000000000000000039b9989cccb456  bigInteger found: 16248138789336150
privateKey found: 16248138789336150
Address found: 1Hpt6MMvhiPUS5UbCRZKV21fr9QkmWVsYk  privateKeyHex found: 0000000000000000000000000000000000000000000000000039b9989cccb456
hexadecimalValue found: 270A3455C5EDB0
privateKeyHex found: 00000000000000000000000000000000000000000000000000270a3455c5edb0  bigInteger found: 10988743985327536
privateKey found: 10988743985327536
Address found: 1K2APayYiHupksJYk67Yy8c7RVXVXWyLhT  privateKeyHex found: 00000000000000000000000000000000000000000000000000270a3455c5edb0

Last Run:	6:24:31 pm
Compile:	0.035s
Execute:	0.32s
Memory:	16.85Mb
CPU:	0.355s

View IL Code