converting phone number back to int64

I have a phone number (000) 000-0开发者_开发知识库000, I would like to convert it back to 0000000000, is there a way to do so?

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Do you really want an integer? A phone number has no meaning as an integer.

Try this if you are using a string:

string fixedString = Regex.Replace(yourString, @"[()\s-]", "");

If you don't know what kind of characters could be in the string then try this:

string fixedString = Regex.Replace(yourString, @"[^\d]", "");

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Int64 somePhone;
Int64.TryParse(Regex.Replace(yourString, @"[()\s-)]", ""), out somePhone)

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How about doing it the old-fashioned but eminently readable way:

    string Strip(string arg)
    {
        StringBuilder sb = new StringBuilder();
        foreach (char c in arg.ToCharArray())
        {
            if (char.IsDigit(c))
            {
                sb.Append(c);
            }
        }
        return sb.ToString();
    }

It's also very slightly faster then RegEx (0.449 sec vs 0.472 sec for 10000 interations).0

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Or for the sake of brevity & readibility (to us less-seasoned programmers :-) )

    public static string GimmeNumbers(this string arg)
    {
        return new string(arg.ToCharArray().Where(c => char.IsDigit(c)).ToArray());
    }

usage:

    string phoneNo = "(000) 000-0000".GimmeNumbers();

or alternatively,

    public static int GimmeNumbers(this string arg)
    {
        return int.Parse(new string(arg.ToCharArray().Where(c => char.IsDigit(c)).ToArray()));
    }

... actually, thinking about it it's not that readable :-)