96 lines
1.8 KiB
Markdown
96 lines
1.8 KiB
Markdown
-----
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menupriority: 1
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kind: article
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created_at: 2009-09-22T22:13:25+02:00
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title: Remplacer tout sauf une partie
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author_name: Yann Esposito
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author_uri: yannesposito.com
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tags:
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- ruby
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- regexp
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- regular expression
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-----
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My problem is simple:
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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
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<div>
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<code class="html">
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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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</code>
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</div>
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I searched a better way to do that, but the best I can do is using `split` and `scan`.
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<div>
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<code class="ruby">
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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>
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</div>
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An usage is:
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<div>
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<code class="ruby">
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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>
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</div>
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A better syntax would be:
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<div>
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<code class="ruby">
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# !!!!!!!!!! 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=$&
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tmp <<= send(f,x)
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if not separator.nil?
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tmp <<= separator
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end
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end
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tmp
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end
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</code>
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</div>
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I would expect the split make a search on a regular expression and then give the matched expression into the `$&` variable. But it is not the case.
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If someone know a nicer way to do that I will be happy to know how.
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