using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
var block = "[0-9a-fA-F]{1,8}";
var pattern = $@"(?<from>{block})\s*:\s*(?<to>{block})";
Console.WriteLine(Regex.IsMatch("12345678 :87654321", pattern));
}
}
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