C# Display string after certain words are found

Basically what I'm trying to do is find the first string that starts with "/Game/Mods" but the problem is how do i tell the program where to end the string? here's an example what a string can look like: string example

As you can see the string starts with "/Game/Mods", i want it to end after the word "TamingSedative", the problem is that the ending word (TamingSedative)is different for every file it has to check, for example: example 2

There you can see that the ending word is now "WeapObsidianSword" (instead of TamingSedative) so basically the string has to end when it comes across the "NUL" but how do i specify that in c# code?