s = "/stats my string"
rx = /^\/stats (.*)/i
# RegExp#match
rx.match(s) {|m|
puts m[1]
# или
puts m.captures[0]
}
# String[RegExp, #]
puts s[rx,1]
# String#scan(RegExp)
puts s.scan(rx).last.first
cyA9ICIvc3RhdHMgbXkgc3RyaW5nIgpyeCA9IC9eXC9zdGF0cyAoLiopL2kKIyBSZWdFeHAjbWF0Y2gKcngubWF0Y2gocykge3xtfAogICAgcHV0cyBtWzFdCiAgICAjINC40LvQuAogICAgcHV0cyBtLmNhcHR1cmVzWzBdCn0KIyBTdHJpbmdbUmVnRXhwLCAjXQpwdXRzIHNbcngsMV0KIyBTdHJpbmcjc2NhbihSZWdFeHApCnB1dHMgcy5zY2FuKHJ4KS5sYXN0LmZpcnN0