Regex to find trailing numbers

I have a string that looks like:

www.blah.com/asdf/asdf/asdfasedf/123

The string may have a slash followed by numbers, like /123 in开发者_开发问答 the above example.

I want to extract the 123 from the string if it is present.

What would my regex be?

Terminate your regular expression with $ to signify the end of the line.

\/\d+$

To actually extract the number, use:

int number;
var match = Regex.Match(inputString,@"\/(\d+)$");
if(match.Success)
    number = int.Parse(match.Groups[1].ToString());

You simply match a group of digits (\d+) and require the string to end after that

(\d+)$

This will match a slash followed by numbers at the end of a string and capture the numbers:

\/(\d*)$