match

        # MatchData.match

(from ruby core)
---
    mtch.match(n)   -> string or nil

---

Returns the captured substring corresponding to the argument. *n* can be
a string or symbol to reference a named capture.

    m = /(.)(.)(\d+)(\d)(\w)?/.match("THX1138.")
    m.match(0)       #=> "HX1138"
    m.match(4)       #=> "8"
    m.match(5)       #=> nil

    m = /(?<foo>.)(.)(?<bar>.+)/.match("hoge")
    m.match(:foo)    #=> "h"
    m.match(:bar)    #=> "ge"