Underbar to camelcase
예) is_online -> isOnline
:s#_\(\l\)#\u\1#g
예) is_online -> IsOnline
:s#\(\%(\<\l\+\)\%(_\)\@=\)\|_\(\l\)#\u\1\2#g
Camelcase to underbar
예) IsOnline -> is_online
:s#\(\<\u\l\+\|\l\+\)\(\u\)#\l\1_\l\2#g
:s#_\(\l\)#\u\1#g
:s#\(\%(\<\l\+\)\%(_\)\@=\)\|_\(\l\)#\u\1\2#g
:s#\(\<\u\l\+\|\l\+\)\(\u\)#\l\1_\l\2#g
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