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copied!<p>You can use <a href="http://rubular.com/r/aQKZviwOzG" rel="nofollow"><code>/\[img(?:\s+caption=".+")?\].+?\[\/img\]/</code></a> to scan the documents:</p> <pre><code>regex = /\[img(?:\s+caption=".+")?\].+?\[\/img\]/ text = <<EOT Lorem Ipsum [img]http://example.org/first.jpg[/img] [img]http://example.org/second.jpg[/img] more lorem ipsum ... Content B: Lorem Ipsum [img caption="Sample caption"]http://example.org/third.jpg[/img] [img]http://example.org/fourth.jpg[/img] Content C: Lorem Ipsum [img]http://example.org/fifth.jpg[/img] more lorem ipsum [img caption="Some other caption"]http://example.org[/img] EOT array = text.scan(regex) puts array </code></pre> <p>Which generates:</p> <pre> [img]http://example.org/first.jpg[/img] [img]http://example.org/second.jpg[/img] [img caption="Sample caption"]http://example.org/third.jpg[/img] [img]http://example.org/fourth.jpg[/img] [img]http://example.org/fifth.jpg[/img] [img caption="Some other caption"]http://example.org[/img] </pre> <p>If you want to ignore the tags and only grab the content, change the regexp to:</p> <pre><code>regex = /\[img(?:\s+caption=".+")?\](.+?)\[\/img\]/ </code></pre> <p>Running again with that change returns:</p> <pre><code>http://example.org/first.jpg http://example.org/second.jpg http://example.org/third.jpg http://example.org/fourth.jpg http://example.org/fifth.jpg http://example.org </code></pre> <p>(<a href="http://rubular.com/r/iBYvvzCoLW" rel="nofollow">Rubular proof</a>)</p> <p>If you need to look for different tags, you can generate an "OR" list easily:</p> <pre><code>Regexp.union(%w[foo img bar]) => /foo|img|bar/ </code></pre> <p>If you need to make sure that "magic" characters are escaped beforehand:</p> <pre><code>Regexp.union(%w[foo img bar].map{ |s| Regexp.escape(s) }) </code></pre>

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