Regex Match/Wildcard

I have a tab delimited text file containing comments/notes.

Any line that contains the the string "read" or "reading" will/should have an 8 digit number that I want to extract. The problem is I don’t know where in the line the 8 digit number could be. As these are user generated comments each line could be different.

Example Line from text file:

3253442999934 did not read book # 98713429

what I have tried:

var m = Regex.Match(realLine, @".*""reading"":""\b(?x)[0 - 9]{8}\b$"".*");
var n = Regex.Match(realLine, @".*""read"":""\b(?x)[0 - 9]{8}\b$"".*");
//string pattern = "bd{8}b$";
Regex regex = new Regex(pattern);

    console.WriteLine((m.Groups[1].Value));
    console.WriteLine((n.Groups[1].Value));

I’m not generating any result, meaning nothing is printed to the console.

var result = Regex.Match(realLine, @"bread(?:ing)?b.*?#s*(d+)")?.Groups[1].Value;