output match and no match to different files

awk

way 1

awk '{if (/root/) print > "match"; else print > "nomatch"; }' /etc/passwd

way 2

awk '{ print > ( /root/ ? "match" : "nomatch" ) }' /etc/passwd

sed

All these below are implementations of test condition like if else in sed

way 1

sed -ne '/root/w match' -e '/root/!w nomatch' /etc/passwd

way 2

sed -ne '/root/bOK; w nomatch' -e 'b; :OK; w match' /etc/passwd

way 3

sed -n '/root/p; //!w nomatch' /etc/passwd > match

way 4

sed -n '/root/!p; //w match' /etc/passwd > nomatch