s/^/a|/
:
s/\w*|/&\n\U&/g
s/a/bab/g
s/d/dd/g
s/A/dad/g
s/C/bb/g
y/cDb12345/aac 1234/
/ /!b
s/\w/|&/g
s/a/___/g
h
s/\S/_/g
s/__/ /
P
g
y/cd/ _/