scan extracts desired pattern from stdin using regexp or delimiter.
$ cat regex.txt
hogehoge_nyan
hohho_nyan
# numbered capture
$ cat regex.txt | scan -p "(.+?)_(.+)" {1},{2}
hogehoge,nyan
hohho,nyan
# named capture
$ cat regex.txt | scan -p "(?<left>.+?)_(?<right>.+)" {left}:{right}
hogehoge:nyan
hohho:nyan
$ cat hoge.csv
aaa,bbb,ccc
xxx,yyy,zzz
# Using delimiter
$ cat hoge.csv | scan -d , {3}
ccc
zzz
$ cat hoge.tsv
aaa bbb ccc
xxx yyy zzz
# default delimiter is '\s+'
$ cat hoge.tsv | scan {2}
bbb
yyy$ gem install specific_install
$ gem specific_install -l https://github.com/genya0407/scan
$ scan --help
Usage: scan [options] OUTPUT_FORMAT
-p [PATTERN] specify regexp
-d [DELIMITER] specify delimiter