I have a list like following:

u042f 12,197,051
ube44ud574 93,721,409
HUMAN 45,754,677
Overwatch 43,437,031 OVERWATE

Now I want to replace spaces with new lines in Comma-Separated number lines like following results:

u042f
12,197,051
ube44ud574
93,721,409
HUMAN
45,754,677
Overwatch
43,437,031
OVERWATE

I tried following regex:

Find What: (^h*)(.*?)(h*,.*$)
Replace With: 12n3

But it not working good and provide me following results:

u042f 12
,197,051
ube44ud574 93
,721,409
HUMAN 45
,754,677
Overwatch 43
,437,031 OVERWATE

Where is my regex problem?