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<link rel="alternate" lang="fr" xml:lang="fr" title="Remplacer tout sauf une partie" type="text/html" hreflang="fr" href="/Scratch/fr/blog/2009-09-replace-all-except-some-part/" />
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<link rel="alternate" lang="en" xml:lang="en" title="replace all except some part" type="text/html" hreflang="en" href="/Scratch/en/blog/2009-09-replace-all-except-some-part/" />
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<title>replace all except some part</title>
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<div class="return"><a href="#entete">↓ Menu ↓</a></div>
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<a href="/Scratch/fr/blog/2009-09-replace-all-except-some-part/" onclick="setLanguage('fr')">en Français</a>
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<h1>
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replace all except some part
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</h1>
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<div id="afterheader">
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<div class="corps">
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<p>My problem is simple:</p>
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<p>I want to filter a text except some part of it. I can match easily the part I don’t want to be filtered. For example</p>
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<div>
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<pre><code class="html">...
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text
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...
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BEGIN not to filter
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...
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text
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...
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END not to filter
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...
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text
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...
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</code></pre>
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</div>
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<p>I searched a better way to do that, but the best I can do is using <code>split</code> and <code>scan</code>.</p>
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<div>
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<pre><code class="ruby">def allExceptCode( f, content )
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# Beware the behaviour will change if you add
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# parenthesis (groups) to the regexp!
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regexp=/<code[^>]*>.*?<\/code>|<pre[^>]*>.*?<\/pre>/m
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tmp=""
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mem=[]
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content.scan(regexp).each do |c|
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mem <<= c
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end
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i=0
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content.split(regexp).each do |x|
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tmp <<= send(f,x)
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if not mem[i].nil?
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tmp <<= mem[i]
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i+=1
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end
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end
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tmp
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end
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</code></pre>
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</div>
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<p>An usage is:</p>
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<div>
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<pre><code class="ruby">def filter(content)
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content.gsub(/e/,'X')
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end
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...
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allExceptCode(:filter, content)
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...
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</code></pre>
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</div>
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<p>A better syntax would be:</p>
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<div>
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<pre><code class="ruby"># !!!!!!!!!! THIS SYNTAX DOES NOT WORK !!!!!!! #
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def allExceptCode( f, content )
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regexp=/<code[^>]*>.*?<\/code>/m
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tmp=""
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content.split(regexp).each do |x|
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separator=$&
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tmp <<= send(f,x)
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if not separator.nil?
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tmp <<= separator
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end
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end
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tmp
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end
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</code></pre>
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</div>
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<p>I would expect the split make a search on a regular expression and then give the matched expression into the <code>$&</code> variable. But it is not the case.</p>
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<p>If someone know a nicer way to do that I will be happy to know how.</p>
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<a href="/Scratch/en/blog/2009-09-Disqus-versus-Intense-Debate--Why-I-switched-/">Disqus versus Intense Debate (Why I switched) <span class="nicer">»</span></a>
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<a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/">Copyright ©, Yann Esposito</a>
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<div id="lastmod">
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Created: 09/22/2009
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Modified: 01/11/2012
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</div>
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<div>
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Entirely done with
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<a href="http://www.vim.org">Vim</a>
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and
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<a href="http://nanoc.stoneship.org">nanoc</a>
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