MongoDB c# Case insensitive search

gistfile1.txt

MongoDB, c#: Case insensitive search
Query.Matches("FirstName", BsonRegularExpression.Create(new Regex(searchKey,RegexOptions.IgnoreCase)));
	
Query.Matches("FieldName", BsonRegularExpression.Create(new Regex(searchKey, RegexOptions.IgnoreCase)))
	
public User FindByEmail(Email email)
{
    return session.GetCollection<User>().AsQueryable()
           .Where(u => u.EmailAddress.ToLower() == email.Address.ToLower()).FirstOrDefault();
}