Get part of the item in a list

[filipmiletic]

Is it possible to change all the subitems at all index number at once. (picture attached)
I need to replace all 8s with 7s at once if it is possible.
Thanks in advance!

[m.rijsmus]

use the string.split node
change 8 into 7
put it back together with the + node

[m.rijsmus]

[filipmiletic]

Thank you, I did it this way, but you gave me an idea!