anarchy golf - the source code

Nest the 0 by kanitawa

x
s/^.*/0/
x
:
y/9876543210/876543210_/
x
s/.*/[&]/
x
/^0$/b1
/0_/s//9/
/^0/s/0/1/
b
:1
g

Note that non-ascii characters in the above source code will be escaped (such as \x9f).