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^[a-zA-Z0-9][a-zA-Z0-9,]*([a-zA-Z0-9])?$
^[0-9A-Za-z][0-9A-Za-z,]*[0-9A-Za-z]$
using System;
using System.Text.RegularExpressions;
namespace ModelTest
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine(CheckRule("1"));
Console.WriteLine(CheckRule("d"));
Console.WriteLine(CheckRule("1d"));
Console.WriteLine(CheckRule("d1"));
Console.WriteLine(CheckRule("#1"));
Console.WriteLine(CheckRule("d,"));
Console.WriteLine(CheckRule("13^d"));
Console.WriteLine(CheckRule("d1.. "));
Console.ReadKey();
}
static bool CheckRule(string s)
{
return Regex.Match(s, "^[a-zA-Z0-9]+$").Success;
}
}
}
^[a-zA-Z0-9]([a-zA-Z0-9,]*[a-zA-Z0-9])?$