I need to check if a string starts with numbers. I want to do this using Regex in C #
public static class StringExtensao
{
public static bool ComecaComNumero(this string str)
{
if (string.IsNullOrEmpty(str))
return false;
return char.IsNumber(Convert.ToChar( str.Substring(0,1)));
}
}
The expression for this is quite simple:
"^\d"
In a function it looks something like this:
using System;
using System.Text.RegularExpressions;
class Program
{
bool ComecaComNumero(String s)
{
Regex r = new Regex(@"^\d");
return r.Match(s).Success;
}
}
Something like this?
public static bool IsNumber(string str)
{
return new Regex(@"^[0-9]+").IsMatch(str);
}