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Diff for: ‎README.md

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## Tips
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* [Vim tip 11: replace characters in Normal mode](https://learnbyexample.github.io/tips/vim-tip-11/)
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* [CLI tip 12: squeeze empty lines](https://learnbyexample.github.io/tips/cli-tip-12/)
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* [Python tip 12: negate a regex grouping](https://learnbyexample.github.io/tips/python-tip-12/)
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* [Vim tip 10: Undo and Redo](https://learnbyexample.github.io/tips/vim-tip-10/)

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<link href="https://learnbyexample.github.io/atom.xml" rel="self" type="application/atom+xml"/>
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<link href="https://learnbyexample.github.io"/>
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<generator uri="https://www.getzola.org/">Zola</generator>
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<updated>2022-06-29T00:00:00+00:00</updated>
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<updated>2022-07-06T00:00:00+00:00</updated>
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<id>https://learnbyexample.github.io/atom.xml</id>
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<entry xml:lang="en">
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<title>Vim tip 11: replace characters in Normal mode</title>
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<published>2022-07-06T00:00:00+00:00</published>
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<updated>2022-07-06T00:00:00+00:00</updated>
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<link href="https://learnbyexample.github.io/tips/vim-tip-11/" type="text/html"/>
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<id>https://learnbyexample.github.io/tips/vim-tip-11/</id>
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<content type="html">&lt;p&gt;Often, you just need to change one character. For example, changing &lt;code&gt;i&lt;&#x2F;code&gt; to &lt;code&gt;j&lt;&#x2F;code&gt;, &lt;code&gt;2&lt;&#x2F;code&gt; to &lt;code&gt;4&lt;&#x2F;code&gt;, &lt;code&gt;&#x27;&lt;&#x2F;code&gt; to &lt;code&gt;&amp;quot;&lt;&#x2F;code&gt; and so on.&lt;&#x2F;p&gt;
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&lt;ul&gt;
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&lt;li&gt;&lt;kbd&gt;rj&lt;&#x2F;kbd&gt; replace the character under the cursor with &lt;code&gt;j&lt;&#x2F;code&gt;&lt;&#x2F;li&gt;
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&lt;li&gt;&lt;kbd&gt;ry&lt;&#x2F;kbd&gt; replace the character under the cursor with &lt;code&gt;y&lt;&#x2F;code&gt;&lt;&#x2F;li&gt;
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&lt;li&gt;&lt;kbd&gt;3ra&lt;&#x2F;kbd&gt; replace the character under cursor as well as the two characters to the right with &lt;code&gt;aaa&lt;&#x2F;code&gt;
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&lt;ul&gt;
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&lt;li&gt;no changes will be made if there aren&#x27;t sufficient characters to match&lt;&#x2F;li&gt;
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&lt;&#x2F;ul&gt;
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&lt;&#x2F;li&gt;
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&lt;&#x2F;ul&gt;
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&lt;p&gt;To replace multiple characters with different characters, use &lt;code&gt;R&lt;&#x2F;code&gt;.&lt;&#x2F;p&gt;
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&lt;ul&gt;
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&lt;li&gt;&lt;kbd&gt;Rlion&lt;&#x2F;kbd&gt; followed by &lt;kbd&gt;Esc&lt;&#x2F;kbd&gt; replace the character under cursor and three characters to the right with &lt;code&gt;lion&lt;&#x2F;code&gt;
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&lt;ul&gt;
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&lt;li&gt;&lt;kbd&gt;Esc&lt;&#x2F;kbd&gt; key marks the completion of &lt;code&gt;R&lt;&#x2F;code&gt; command&lt;&#x2F;li&gt;
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&lt;li&gt;&lt;kbd&gt;Backspace&lt;&#x2F;kbd&gt; key will act as an undo command to give back the character that was replaced&lt;&#x2F;li&gt;
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&lt;li&gt;if you are replacing at the end of a line, the line will be automatically extended if needed&lt;&#x2F;li&gt;
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&lt;&#x2F;ul&gt;
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&lt;&#x2F;li&gt;
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&lt;&#x2F;ul&gt;
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&lt;p&gt;The advantage of &lt;code&gt;r&lt;&#x2F;code&gt; and &lt;code&gt;R&lt;&#x2F;code&gt; commands is that you remain in the Normal mode, without needing to switch to Insert mode and back.&lt;&#x2F;p&gt;
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&lt;p&gt;&lt;strong&gt;Video demo&lt;&#x2F;strong&gt;:&lt;&#x2F;p&gt;
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&lt;p align=&quot;center&quot;&gt;&lt;iframe width=&quot;560&quot; height=&quot;315&quot; loading=&quot;lazy&quot; src=&quot;https:&#x2F;&#x2F;www.youtube.com&#x2F;embed&#x2F;cNRNiwIcqNc&quot; title=&quot;YouTube video player&quot; frameborder=&quot;0&quot; allow=&quot;accelerometer; clipboard-write; encrypted-media; gyroscope; picture-in-picture&quot; allowfullscreen&gt;&lt;&#x2F;iframe&gt;&lt;&#x2F;p&gt;
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&lt;br&gt;
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&lt;p&gt;&lt;img src=&quot;&#x2F;images&#x2F;info.svg&quot; alt=&quot;info&quot; &#x2F;&gt; See also my &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;vim_reference&quot;&gt;Vim Reference Guide&lt;&#x2F;a&gt; and &lt;a href=&quot;https:&#x2F;&#x2F;learnbyexample.github.io&#x2F;curated_resources&#x2F;vim.html&quot;&gt;curated list of resources for Vim&lt;&#x2F;a&gt;.&lt;&#x2F;p&gt;
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</content>
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</entry>
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<entry xml:lang="en">
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<title>CLI tip 12: squeeze empty lines</title>
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<published>2022-06-29T00:00:00+00:00</published>

Diff for: ‎books/index.html

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<li><strong>Awesome regex</strong>: <a href="https://leanpub.com/b/regex">leanpub</a> or <a href="https://learnbyexample.gumroad.com/l/regex">gumroad</a>
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<ul>
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<li>Python, Ruby, JavaScript Regular expressions</li>
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<li>GNU grep, ripgrep, GNU sed, GNU awk cli tools</li>
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<li>GNU grep, ripgrep, GNU sed, GNU awk cli tools (BRE/ERE, PCRE, Rust regex crate, PCRE2)</li>
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<li>Vim regexp</li>
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</ul>
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</li>
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<li><strong>Magical one-liners</strong>: <a href="https://leanpub.com/b/oneliners">leanpub</a> or <a href="https://learnbyexample.gumroad.com/l/oneliners">gumroad</a>
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<p>Hi, great work releasing this! Trying to explain vim concisely is always an interesting challenge and I had a great time reading your attempt in this book. I always find it really interesting on how people try to group certain vim functions in a way that makes sense to people that don't use vim. I think you cover that idea pretty well in your 'Vim philosophy and features' section whilst not making it overly abstract and keeping it relatable.</p>
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<p>— <a href="https://news.ycombinator.com/item?id=30684232">feedback on Hacker News</a> by doix for &quot;Vim Reference Guide&quot;</p>
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</blockquote>
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<blockquote>
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<p>I consider myself pretty experienced at shell-fu and capable of doing most things I set out to achieve in either bash scripts or fearless one-liners. However, my awk is rudimentary at best, I think mostly because it's such an unforgiving environment to experiment in. These books you've written are great for a bit of first principles insight and then quickly building up to functional usage. I will have no hesitation in referring colleagues to them!</p>
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<p>— <a href="https://news.ycombinator.com/item?id=31930840">feedback on Hacker News</a></p>
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</blockquote>
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<br>
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<h2 id="100-page-python-intro"><p style="color: #ff9933">100 Page Python Intro</h2>
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<p>Short, introductory guide for the Python programming language, suited for those already familiar with programming basics.</p>

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<loc>https://learnbyexample.github.io/books/</loc>
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<a href="https:&#x2F;&#x2F;learnbyexample.github.io&#x2F;tips&#x2F;vim-tip-11&#x2F;">Vim tip 11: replace characters in Normal mode</a>
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<a href="https:&#x2F;&#x2F;learnbyexample.github.io&#x2F;tips&#x2F;vim-tip-11&#x2F;">Vim tip 11: replace characters in Normal mode</a>
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<h2 id="vim-memo"><p style="color: #ff6600"><a name="vim"></a>Vim 📝</h2>
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<li><a href="https://learnbyexample.github.io/tips/vim-tip-11/">Vim tip 11: replace characters in Normal mode</a></li>
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<li><a href="https://learnbyexample.github.io/tips/vim-tip-10/">Vim tip 10: Undo and Redo</a></li>
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<li><a href="https://learnbyexample.github.io/tips/vim-tip-9/">Vim tip 9: named registers</a></li>
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<li><a href="https://learnbyexample.github.io/tips/vim-tip-7/">Vim tip 7: changing case in Normal mode</a></li>

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<a href="https:&#x2F;&#x2F;learnbyexample.github.io&#x2F;tips&#x2F;vim-tip-11&#x2F;">Vim tip 11: replace characters in Normal mode</a>
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<span class="post__time">2022-07-06</span>
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<p>Often, you just need to change one character. For example, changing <code>i</code> to <code>j</code>, <code>2</code> to <code>4</code>, <code>'</code> to <code>&quot;</code> and so on.</p>
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<li><kbd>rj</kbd> replace the character under the cursor with <code>j</code></li>
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<li><kbd>ry</kbd> replace the character under the cursor with <code>y</code></li>
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<li><kbd>3ra</kbd> replace the character under cursor as well as the two characters to the right with <code>aaa</code>
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<ul>
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<li>no changes will be made if there aren't sufficient characters to match</li>
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<p>To replace multiple characters with different characters, use <code>R</code>.</p>
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<ul>
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<li><kbd>Rlion</kbd> followed by <kbd>Esc</kbd> replace the character under cursor and three characters to the right with <code>lion</code>
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<ul>
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<li><kbd>Esc</kbd> key marks the completion of <code>R</code> command</li>
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<li><kbd>Backspace</kbd> key will act as an undo command to give back the character that was replaced</li>
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<li>if you are replacing at the end of a line, the line will be automatically extended if needed</li>
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<p>The advantage of <code>r</code> and <code>R</code> commands is that you remain in the Normal mode, without needing to switch to Insert mode and back.</p>
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<p><strong>Video demo</strong>:</p>
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<p align="center"><iframe width="560" height="315" loading="lazy" src="https://www.youtube.com/embed/cNRNiwIcqNc" title="YouTube video player" frameborder="0" allow="accelerometer; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe></p>
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<br>
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<p><img src="/images/info.svg" alt="info" /> See also my <a href="https://github.com/learnbyexample/vim_reference">Vim Reference Guide</a> and <a href="https://learnbyexample.github.io/curated_resources/vim.html">curated list of resources for Vim</a>.</p>
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<a href="https:&#x2F;&#x2F;learnbyexample.github.io&#x2F;tags&#x2F;vim&#x2F;">#vim</a>
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<a href="https:&#x2F;&#x2F;learnbyexample.github.io&#x2F;tags&#x2F;tip&#x2F;">#tip</a>
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