From: Robert Klemme <shortcutter@...>
Date: 2012-09-03T22:01:29+09:00
Subject: Re: Extract # Number from a string

On Mon, Sep 3, 2012 at 2:27 PM, Brian Candler <lists@ruby-forum.com> wrote:
> Robert Klemme wrote in post #1074406:

>> irb(main):009:0> arr.map {|s| s[/(?<=#)\d+/]}
>
> ...although the positive lookbehind assertion (?<=...) is a somewhat
> esoteric feature of regexps.

I am not sure I agree on "esoteric".  If you had said it is a more
recent feature, then I'd readily agree.  I can name off the top of my
head at least three mainstream programming languages which support it
(Java, Ruby >= 1.9 and Perl).

> You can avoid it using the form
> String#[regexp, fixnum] to get just the captured value that you are
> interested in.

Right.

> There's certainly More Than One Way To Do It :-)

If anything, that is true. :-)

Cheers

robert

-- 
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