What is this code doing?

I stepped thru this code but still not sure what it'ssupposed to do:
if address1 = "XYZ street"
  Address2 ="ABC street"

This code does some regex and i think it should get XYZ?? What is that match.Success looking for?

Regex _rxFirstToken = new Regex(@"^\s*(?<First>\S+)", RegexOptions.Compiled);

string token = string.Empty;
            Match match = _rxFirstToken.Match(address.Address1 + " " + address.Address2);
 
            if (match.Success)
            {
                token = match.Groups["First"].Value;
            }
 
            return token;

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