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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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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>Remplacer tout sauf une partie</title>
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<div class="return"><a href="#entete">↓ Menu ↓</a></div>
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<a href="/Scratch/en/blog/2009-09-replace-all-except-some-part/" onclick="setLanguage('en')">in English</a>
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<div id="titre">
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<h1>
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Remplacer tout sauf une partie
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</h1>
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</div>
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<div class="flush"></div>
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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 class="twilight">
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...
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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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</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 class="twilight">
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<span class="Keyword">def</span> <span class="Entity">allExceptCode</span>(<span class="Variable"> f<span class="Variable">,</span> content </span>)
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regexp<span class="Keyword">=</span><span class="StringRegexp"><span class="StringRegexp">/</span></span><span class="StringRegexp"><code<span class="StringRegexp"><span class="StringRegexp">[</span>^><span class="StringRegexp">]</span></span>*>.*?<<span class="StringRegexpSpecial">\/</span>code></span><span class="StringRegexp"><span class="StringRegexp">/m</span></span>
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tmp<span class="Keyword">=</span><span class="String"><span class="String">"</span><span class="String">"</span></span>
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mem<span class="Keyword">=</span>[]
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content.<span class="Entity">scan</span>(regexp).<span class="Entity">each</span> <span class="Keyword">do </span>|<span class="Variable">c</span>|
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mem <span class="Keyword"><<=</span> c
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<span class="Keyword">end</span>
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i<span class="Keyword">=</span><span class="Constant">0</span>
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content.<span class="Entity">split</span>(regexp).<span class="Entity">each</span> <span class="Keyword">do </span>|<span class="Variable">x</span>|
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tmp <span class="Keyword"><<=</span> <span class="Entity">send</span>(f,x)
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<span class="Keyword">if</span> <span class="Keyword">not</span> mem[i].<span class="Entity">nil?</span>
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tmp <span class="Keyword"><<=</span> mem[i]
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i<span class="Keyword">+=</span><span class="Constant">1</span>
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<span class="Keyword">end</span>
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<span class="Keyword">end</span>
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tmp
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<span class="Keyword">end</span>
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</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 class="twilight">
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<span class="Keyword">def</span> <span class="Entity">filter</span>(<span class="Variable">content</span>)
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content.<span class="Entity">gsub</span>(<span class="StringRegexp"><span class="StringRegexp">/</span></span><span class="StringRegexp">e</span><span class="StringRegexp"><span class="StringRegexp">/</span></span>,<span class="String"><span class="String">'</span>X<span class="String">'</span></span>)
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<span class="Keyword">end</span>
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...
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<span class="Entity">allExceptCode</span>(<span class="Constant"><span class="Constant">:</span>filter</span>, content)
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...
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</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 class="twilight">
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<span class="Comment"><span class="Comment">#</span> !!!!!!!!!! THIS SYNTAX DOES NOT WORK !!!!!!! #</span>
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<span class="Keyword">def</span> <span class="Entity">allExceptCode</span>(<span class="Variable"> f<span class="Variable">,</span> content </span>)
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regexp<span class="Keyword">=</span><span class="StringRegexp"><span class="StringRegexp">/</span></span><span class="StringRegexp"><code<span class="StringRegexp"><span class="StringRegexp">[</span>^><span class="StringRegexp">]</span></span>*>.*?<<span class="StringRegexpSpecial">\/</span>code></span><span class="StringRegexp"><span class="StringRegexp">/m</span></span>
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tmp<span class="Keyword">=</span><span class="String"><span class="String">"</span><span class="String">"</span></span>
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content.<span class="Entity">split</span>(regexp).<span class="Entity">each</span> <span class="Keyword">do </span>|<span class="Variable">x</span>|
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separator<span class="Keyword">=</span><span class="Variable"><span class="Variable">$</span>&</span>
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tmp <span class="Keyword"><<=</span> <span class="Entity">send</span>(f,x)
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<span class="Keyword">if</span> <span class="Keyword">not</span> separator.<span class="Entity">nil?</span>
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tmp <span class="Keyword"><<=</span> separator
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<span class="Keyword">end</span>
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<span class="Keyword">end</span>
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tmp
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<span class="Keyword">end</span>
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</pre>
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</div>
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<p>I would expect the split make a search on a regular expression and then give the matched expression into the <code>$&</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/fr/blog/11_Load_Disqus_Asynchronously/"><span class="nicer">«</span> Load Disqus Asynchronously [en]</a>
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<a href="/Scratch/fr/blog/2009-09-Disqus-versus-Intense-Debate--Why-I-switched-/">Disqus contre Intense Debate (pourquois j'ai changé) <span class="nicer">»</span></a>
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<a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/deed.fr">Droits de reproduction ©, Yann Esposito</a>
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Écrit le : 22/09/2009
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modifié le : 09/05/2010
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