search for regexp in stdin
$ go get -u github.com/bigflood/strmatch
$ ls -l
total 41
-rw-r--r-- 1 xxxxx 1049089 35147 Jul 19 17:35 LICENSE
-rw-r--r-- 1 xxxxx 1049089 1755 Jul 19 17:42 main.go
-rw-r--r-- 1 xxxxx 1049089 38 Jul 19 17:35 README.md
$ ls -l | strmatch "\d\d ([^ ]+)$"
LICENSE
main.go
README.md
$ ls -l | strmatch -sep " " "\d\d ([^ ]+)$"
LICENSE main.go README.md