Regular expression (getting number, C#)

Please help me to write Regular expression on C# for getting Int64 value from string:

"NumberLong("634461051992965873")"

my string inc开发者_StackOverflow中文版ludes NumberLong part;

so as result must be 634461051992965873

Thank you!)))

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string Temp = "Hax00r L33t";
string Output = Regex.Replace(Temp, "[^0-9]", "");
long num = long.Parse(Output);

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long.Parse("634461051992965873") does the job, but you could check long.TryParse too.

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String txt = "634461051992965873";
int nbr;

if(Int64.TryParse(txt, out nbr)) {
    // text can be converted to Integer
}