From: Adam Bozanich <adam.boz@...>
Date: 2007-04-27T00:18:47+09:00
Subject: Re: [patch] gsub with backslash characters in replacement string

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On 4/26/07, Yukihiro Matsumoto <matz@ruby-lang.org> wrote:
>
> Hi,
>
> In message "Re: [patch] gsub with backslash characters in replacement
> string"
>     on Thu, 26 Apr 2007 17:09:42 +0900, "Adam Bozanich" <adam.boz@gmail.com
> > writes:
>
> |Hello, spotted this one the other day:
> |
> |irb(main):001:0> '\\'.gsub('\\','\\\\')
> |=> "\\"
> |irb(main):002:0> '\\'.gsub('\\','\\\\\\')
> |=> "\\\\"
> |
> |The following patch seems to fix things on my system
>
> It was intentional to escape backslashes in replacement string.
> If it were a bug, how do we escape backslashes?  Any idea?
>
>                                                         matz.
>
>
Not sure that I'm understanding you here.

let's try again.

test.rb:

1.upto(6) do |x|
    print "a".gsub("a","\\"*x).size , " "
end

print "a".gsub("a","\n")

before patch output is:
1 1 2 2 3 3

after patch output is:
1 2 3 4 5 6

Note that the newline works in both cases.

-Adam

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On 4/26/07, <b class="gmail_sendername">Yukihiro Matsumoto</b> &lt;<a href="mailto:matz@ruby-lang.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">matz@ruby-lang.org</a>&gt; wrote:<div><span class="gmail_quote">
</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi,<br><br>In message &quot;Re: [patch] gsub with backslash characters in replacement string&quot;<br>&nbsp;&nbsp;&nbsp;&nbsp;on Thu, 26 Apr 2007 17:09:42 +0900, &quot;Adam Bozanich&quot; &lt;<a href="mailto:adam.boz@gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
adam.boz@gmail.com
</a>&gt; writes:<br><br>|Hello, spotted this one the other day:<br>|<br>|irb(main):001:0&gt; &#39;\\&#39;.gsub(&#39;\\&#39;,&#39;\\\\&#39;)<br>|=&gt; &quot;\\&quot;<br>|irb(main):002:0&gt; &#39;\\&#39;.gsub(&#39;\\&#39;,&#39;\\\\\\&#39;)
<br>|=&gt; &quot;\\\\&quot;<br>|<br>|The following patch seems to fix things on my system<br><br>It was intentional to escape backslashes in replacement string.<br>If it were a bug, how do we escape backslashes?&nbsp;&nbsp;Any idea?
<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;matz.<br><br></blockquote></div><br>Not sure that I&#39;m understanding you here.<br><br>let&#39;s try again.<br><br>test.rb:<br><br>1.upto(6) do |x|<br>&nbsp;&nbsp;&nbsp; print &quot;a&quot;.gsub(&quot;a&quot;,&quot;\\&quot;*x).size , &quot; &quot;
<br>end<br><br>print &quot;a&quot;.gsub(&quot;a&quot;,&quot;\n&quot;)<br><br>before patch output is:<br>1 1 2 2 3 3 <br><br>after patch output is:<br>1 2 3 4 5 6 <br><br>Note that the newline works in both cases. <br><br>
-Adam<br>

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