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  <author_name>xlc</author_name>
  <author_url>https://blog.hatena.ne.jp/xlc/</author_url>
  <blog_title>koba::blog</blog_title>
  <blog_url>https://blog.kobalab.net/</blog_url>
  <categories>
    <anon>Perl</anon>
  </categories>
  <description>こんな感じかな。 my $plugin_regex; $plugin_regex = qr/ &amp;\w+ (?: \( .*? \) )? (?: { (?: (??{$plugin_regex}) | .*? )+ } )? ; /x; 動的正規表現を使えない場合は、こんな感じで5段の入れ子までは大丈夫。 my $p1 = qr/&amp;\w+(?:\(.*?\))?(?:{(?:.*?)+})?;/; my $p2 = qr/&amp;\w+(?:\(.*?\))?(?:{(?:$p1|.*?)+})?;/; my $p3 = qr/&amp;\w+(?:\(.*?\))?(?:{(?:$p2|.*?)+})?;…</description>
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  <image_url></image_url>
  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2005-12-04 23:19:35</published>
  <title> PukiWikiのプラグインの正規表現</title>
  <type>rich</type>
  <url>https://blog.kobalab.net/entry/20051204/1133705975</url>
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