From: Tanaka Akira <akr@...17n.org>
Date: 2002-04-01T16:32:22+09:00
Subject: [ruby-dev:16700] Re: assignment nil to $~

In article <1017631490.892199.30753.nullmailer@ev.netlab.jp>,
  matz@ruby-lang.org (Yukihiro Matsumoto) writes:

> $B$$$$$(!"(Bnil$B$b@5Ev$JCM$G$7$?$M!#D>$7$^$9!#(B

$B$J$k$[$I!#(B

$B$5$F!"$=$l$O$=$l$H$7$F!"(B$~ $B$,%m!<%+%k%9%3!<%W$G$"$j!"(B$~ $B$K$$$/$iBeF~$7(B
$B$F$b%a%=%C%I$N30$K$O1F6A$rM?$($i$l$J$$$3$H$K:#99$J$,$i$K5$$,$D$-$^$7$?!#(B
$B30$K1F6A$rM?$($kJ}K!$C$F$"$k$s$G$7$g$&$+(B?

$B$?$H$($P!"(BString#scan $B$N(B wrapper $B$r<!$N$h$&$KDj5A$7$F$b!"(B$~ $B$K4X$9$k5s(B
$BF0$O0lCW$7$^$;$s!#(B$~ $B$K4X$9$k5sF0$b0lCW$9$k$h$&$J(B wrapper $B$C$F=q$1$k$s(B
$B$G$7$g$&$+(B?

% ruby -e '
"abc".scan(/./) { p $~.to_a }

class String
  def scan2(*args, &block)
    scan(*args, &block)
  end
end

"abc".scan2(/./) { p $~.to_a }
'
["a"]
["b"]
["c"]
["c"]
["c"]
["c"]
-- 
[$BEDCf(B $BE/(B][$B$?$J$+(B $B$"$-$i(B][Tanaka Akira]
$B!V$U$($m(B! $B$o$+$a$A$c$s:n@o$G$9$(C"=$B!W(B(Little Worker, $B7KM7@84](B)