ruby-dev

原です。

From: matz@netlab.co.jp (Yukihiro Matsumoto)
Subject: [ruby-dev:1064] Re: Regexp#operators (Re: ruby 1.1b1 released)
Date: Fri, 12 Dec 97 12:19:14 +0900

> まつもと ゆきひろです

> In message "[ruby-dev:1050] Re: Regexp#operators (Re: ruby 1.1b1 released)"
>     on 97/12/11, Shin-ichiro HARA <sinara@blade.nagaokaut.ac.jp> writes:
> 
> |だからこの Regexp に演算子を定義するのは、完全にはうまく行かないんで
> |しょう。でも、やっぱり正規表現の演算ができるととても便利ですよね。
> 
> ということは，どのような演算を用意すれば使いやすく，理論的に
> 「だきょうできる」んでしょうか？

毎回言う事が違って恐縮です。やっぱり最初の通り、

/foo/ + /bar/ = /(?:foo)(?:bar)/

/foo/ | /bar/ = /foo|bar/

とし、

/foo/ & /bar/ = /(?=foo)bar/

~ /foo/       = /(?:(?!foo).)*/

も付け加えると。一応これでどうでしょう？

ちなみにこの場合、string =~ /foo/ & /bar/ は、
string =~ /foo/ && string =~ /bar/ と結構異なります。

しかし、string =~ ~/foo/ は string !=~ /foo/ とほぼ同じです。

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[ruby-dev:1097] Re: Regexp#operators (Re: ruby 1.1b1 released)

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