Count letters after a specific word

I have this response from a server: HTTP-Version: WEB 981.20\r\n\r\nlogintype=none&since=today

I know you can count letters by using the function len() but this function will count all letters of the response.

How can I count the letters after this phrase: HTTP-Version: WEB 981.20\r\n\r\n?

The result should be 26.

>Solution :

Try out this python code:

response = "HTTP-Version: WEB 981.20\r\n\r\nlogintype=none&since=today"
substring = response.split("HTTP-Version: WEB 981.20\r\n\r\n")[1]
print(substring)

This code just grabs whatever is after the string you provided and puts it into a substring