Question

I am trying to input a text file that contains MD5 hashes and keywords (one per line) into a C# app. Is there a way to check if a string is an MD5 hash? I looked on MSDN and couldn’t find anything in the MD5 class.

Answer 1

Use Regex like this:

public static bool IsMD5(string input)
{
    if (String.IsNullOrEmpty(input))
    {
        return false;
    }

    return Regex.IsMatch(input, "^[0-9a-fA-F]{32}$", RegexOptions.Compiled);
}