Handling a .txt text

[reinalazaro]

Hi, Folks! I'm trying to open a .txt file and find a line with a specific expression but the return isn't what I expected:

 f = open("file.txt", "r")

 for line in f: 
   
       if "Net" in line: 
       
           print(line)
       else:
           print("Didn't find")

 f.close()

So, what i get is a lot of "Didn't find" but I know that there's this expression in the file. And, I noticed that if i ask for just one caracter, like "N" instead the "Net", the code returns lines with it.