From: Paul Harrington <xenogenesis@...>
Date: 2010-02-28T05:45:42+09:00
Subject: Re: Interpolation question

Paul Harrington wrote:
> Seeeeems like you're looking for eval.
> 
> Of course, this mean you absolutely trust your input.
> 
> Alternatively, nothing stops you from just storing the values in a hash, 
> doing something likke
> 
> fields = {"wibble" => 2.0, "bobble" => 3.0}
> newtext = text.gsub(%r{<field>(.*?)</field>}) {|value| fields[value]}
> 
> *Still* this assumes that you absolutely know your input will always be 
> in this exact format, otherwise (for example if you're not the person 
> generating the input) use an actual XML parser (like Nokogiri).
> 
> Dudebot wrote:
>> Thanks, Luc, but that's not what I need.  That produces
>> 
>> this is an wibble
>> of stuff bobble
>> 
>> instead of
>> 
>> this is an 2.0
>> of stuff 3.0
>> 
>> I need it to interpolate the value of the expressions, not the
>> expressions themselves.  Is this not possible in Ruby?

Wow let me try that post again.

$1, $2, etc are the capture globals; the value passed to the block 
passed to gsub is the match itself.

So you want text.gsub(%r{<field>(.*?)</field>}) {fields[$1]}



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