Ruby 1.9.0 リファレンスマニュアル > ライブラリ一覧 > library _builtin > class MatchData > names

instance method MatchData#names

names -> Array

Returns a list of names of captures as an array of strings. It is same as mtch.regexp.names.

/(?<foo>.)(?<bar>.)(?<baz>.)/.match("hoge").names
#=> ["foo", "bar", "baz"]

m = /(?<x>.)(?<y>.)?/.match("a") #=> #<MatchData "a" x:"a" y:nil>
m.names                          #=> ["x", "y"]