Get last characters while character != "_"

Question

I have string like

string test = "http://example.com/upload/user/80_747.jpg"
string test2 = "http://example.com/upload/user/80_4747.jpg"

In both cases i need "747" or "4747". Is there any auto or pre-made function for this or i need to do it fully manual.

ASP.NET C# 4.0

Answer 1

You can split string with _ character and take the last string of result array then again split it with . character and take the first string of result array.

in JS

test.split('_')[1].split('.', 1)[0];

in CS use Split, SubString and IndexOf methods of String class.