/\(+ \|^\)m\w*\($\| +\)/cmysterious
s/ //g
y/*/_/
s/\w*[0a-z]\w*/0/g
s/0+\|+0//g
:
y/54321/4321a/
s/[1-4]/&a/g
t
s/\(\w*\)_aa/\1+\1_a/
s/_+/+/
s/_$//
s/_a\>//
t
s/[^a]//g
s/a\{10\}/b/g
s/b$/b 0/
s/^b*\|a*$/&0123456789 /g
:a
s/[ab][0-9]//
ta
s/\B\w *//g
Note that non-ascii characters in the above source code will be escaped (such as \x9f).