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    <pre><code>use strict; use warnings; while (&lt;DATA&gt;) { while (m#/(\*?)(.*?)\1/#g) { print "$2\n"; } } __DATA__ There are many who dare not kill themselves for [/fear/] of what the neighbors will say. Advice is what we ask for when we already know the /* answer */ but wish we didn’t. </code></pre> <p>As a one-liner:</p> <pre><code>perl -nlwe 'while (m#/(\*?)(.*?)\1/#g) { print $2 }' input.txt </code></pre> <p>The inner while loop will iterate between all matches with the <code>/g</code> modifier. The backreference <code>\1</code> will make sure we only match identical open/close tags.</p> <p>If you need to match blocks that extend over multiple lines, you need to slurp the input:</p> <pre><code>use strict; use warnings; $/ = undef; while (&lt;DATA&gt;) { while (m#/(\*?)(.*?)\1/#sg) { print "$2\n"; } } __DATA__ There are many who dare not kill themselves for [/fear/] of what the neighbors will say. /* foofer */ Advice is what we ask for when we already know the /* answer */ but wish we didn’t. foo bar / baz baaz / fooz </code></pre> <p>One-liner:</p> <pre><code>perl -0777 -nlwe 'while (m#/(\*?)(.*?)\1/#sg) { print $2 }' input.txt </code></pre> <p>The <code>-0777</code> switch and <code>$/ = undef</code> will cause file slurping, meaning all of the file is read into a scalar. I also added the <code>/s</code> modifier to allow the wildcard <code>.</code> to match newlines.</p> <p>Explanation for the regex: <code>m#/(\*?)(.*?)\1/#sg</code></p> <pre><code>m# # a simple m//, but with # as delimiter instead of slash /(\*?) # slash followed by optional * (.*?) # shortest possible string of wildcard characters \1/ # backref to optional *, followed by slash #sg # s modifier to make . match \n, and g modifier </code></pre> <p>The "magic" here is that the backreference requires a star <code>*</code> only when one is found before it.</p>
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    1. POExtract a specific pattern from lines with sed, awk or perl
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    1. COWill it match over multiple lines?
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    2. CO@Zaid It does now. :)
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    3. COGood job, though your regex is a little sore on my eyes :)
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