Hello.
I a trying to make a test using 
But my use seems not running properly and I can't find why !!!!!!
The fisrt one runs properly but not the two others even if they contains the word " VTT" they don't ! :
Thank you for your answer.*I al doing test on my side and its works properly
So my mistake must be somewhere else ... 
You don’t need the green logic blocks. contains piece will return true or false by itself