Question

i have a string like this:

 some_string = "A simple demo of SMS text messaging.\r\n+CMGW: 3216\r\n\r\nOK\r\n\"

im coming from vb.net and i need to know in c#, if i know the position of CMGW, how do i get “3216” out of there?

i know that my start should be the position of CMGW + 6, but how do i make it stop as soon as it finds “\r” ??

again, my end result should be 3216

thank you!

Answer 1

Find the index of \r from the start of where you’re interested in, and use the Substring overload which takes a length:

// Production code: add validation here.
// (Check for each index being -1, meaning "not found")
int cmgwIndex = text.IndexOf("CMGW: ");

// Just a helper variable; makes the code below slightly prettier
int startIndex = cmgwIndex + 6;
int crIndex = text.IndexOf("\r", startIndex);

string middlePart = text.Substring(startIndex, crIndex - startIndex);