you are welcome!

>However, @ 1st, it doesn’t work,
Yes i know, that’s called “learning by doing”.
That way you will recognize it better rather
then I had provided you to the whole solution.

>is it SAFE to enter the value very high (I mean 100 for example).
Yes it will be save, especially since you limited it
by utilizing the non-greedy modifier.
Only with even higher value on looong documents
on older computers from the nineties this would
be an issue i guess.