From: Robert Klemme <shortcutter@...>
Date: 2013-04-18T23:15:38+09:00
Subject: Re: String index produces unanticipated result

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On Wed, Apr 17, 2013 at 10:41 PM, Thomas Luedeke <lists@ruby-forum.com>wrote:

> Thanks. I am running Ruby 1.8.7.  That would explain why online irb gave
> me what I expected.
>
> What I used that worked was line[0..4].strip[0..0].   Makes me cringe,
> but it does work.
>

Why then don't you do something like this:

irb(main):005:0> s="    9    3    3    0    0"
=> "    9    3    3    0    0"
irb(main):006:0> s.scan(/\d+/).map(&:to_i)[0, 5].include? 9
=> true

For 1.8

irb(main):007:0> s.scan(/\d+/).map {|m| m.to_i}[0, 5].include? 9
=> true

Or, with a regex

irb(main):009:0> /\A\s*(?:\d+\s+){0,4}9\D/ =~ s
=> 0

Kind regards

robert


-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Wed, Apr 17, 2013 at 10:41 PM, Thomas Luedeke <span dir=3D"ltr">=
&lt;<a href=3D"mailto:lists@ruby-forum.com" target=3D"_blank">lists@ruby-fo=
rum.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">Thanks. I am running Ruby 1.8.7. =A0That would explain why=
 online irb gave<br>

me what I expected.<br>
<br>
What I used that worked was line[0..4].strip[0..0]. =A0 Makes me cringe,<br=
>
but it does work.<br></blockquote><div><br></div><div style>Why then don&#3=
9;t you do something like this:</div><div style><br></div><div style><div>i=
rb(main):005:0&gt; s=3D&quot; =A0 =A09 =A0 =A03 =A0 =A03 =A0 =A00 =A0 =A00&=
quot;</div><div>=3D&gt; &quot; =A0 =A09 =A0 =A03 =A0 =A03 =A0 =A00 =A0 =A00=
&quot;</div>
<div>irb(main):006:0&gt; s.scan(/\d+/).map(&amp;:to_i)[0, 5].include? 9</di=
v><div>=3D&gt; true</div><div><br></div><div style>For 1.8</div><div style>=
<br></div><div style><div>irb(main):007:0&gt; s.scan(/\d+/).map {|m| m.to_i=
}[0, 5].include? 9</div>
<div>=3D&gt; true</div><div><br></div><div style>Or, with a regex</div><div=
 style><div><br></div><div>irb(main):009:0&gt; /\A\s*(?:\d+\s+){0,4}9\D/ =
=3D~ s</div><div>=3D&gt; 0</div><div><br></div></div></div><div></div></div=
></div>
<div class=3D"gmail_extra">Kind regards<br></div></div><div class=3D"gmail_=
extra"><br></div><div class=3D"gmail_extra">robert<br><br clear=3D"all"><di=
v><br></div>-- <br>remember.guy do |as, often| as.you_can - without end<br>=
<a href=3D"http://blog.rubybestpractices.com/">http://blog.rubybestpractice=
s.com/</a>
</div></div>

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