ref: b8837029c5565f5ee91fabf205f740a380f4c972 dir: /test/t.match1/
NF > 0 && match($NF, $1) { print $0, RSTART, RLENGTH if (RLENGTH != length($1)) printf "match error at %d: %d %d\n", NR, RLENGTH, RSTART >"/dev/tty" }