How to select an specific line/caracter of an text?

Ay bois, i'm making an game that will need to get an value from an text file. So, i already loaded him into the construct and i'm getting the text that i want, but, i want to get an specific line/caracter of the text, like:

Example text.

Just to get the "text.".

So, my original text file is: OnStartup:LoadLayout("None"); , and i want to get only the ("None"); part (Like, geting the 21 caracter and just all the nexts after him.).

Objective: Get the ("None"); part on these text: OnStartup:LoadLayout("None"); .

Set s to right(original_text, len(original_text)-21)

You can also use mid, left, tokenat, find, replace expressions. Read about them here:

scirra.com/manual/126/system-expressions

Very thanks bro!