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‎README.md

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## Posts
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* [100+ Interactive Python Regex Exercises](https://learnbyexample.github.io/interactive-python-regex-exercises/)
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* [Python Regular Expressions Playground](https://learnbyexample.github.io/python-regex-playground/)
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* [Understanding Python re(gex)? book announcement](https://learnbyexample.github.io/understanding-python-regex-announcement/)
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* [Python Regex Surprises](https://learnbyexample.github.io/python-regex-surprises/)

‎atom.xml

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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>2023-03-15T00:00:00+00:00</updated>
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<updated>2023-03-20T00:00:00+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>100+ Interactive Python Regex Exercises</title>
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<published>2023-03-20T00:00:00+00:00</published>
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<updated>2023-03-20T00:00:00+00:00</updated>
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<link rel="alternate" href="https://learnbyexample.github.io/interactive-python-regex-exercises/" type="text/html"/>
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<id>https://learnbyexample.github.io/interactive-python-regex-exercises/</id>
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<content type="html">&lt;p&gt;Having an interactive program that automatically loads questions and checks the solution is wonderful to have while learning a topic. This &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;TUI-apps&#x2F;blob&#x2F;main&#x2F;PyRegexExercises&quot;&gt;TUI app&lt;&#x2F;a&gt; has beginner to advanced level exercises for Python regular expressions. There are more than 100 exercises covering both the builtin &lt;code&gt;re&lt;&#x2F;code&gt; and third-party &lt;code&gt;regex&lt;&#x2F;code&gt; module.&lt;&#x2F;p&gt;
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&lt;p align=&quot;center&quot;&gt;&lt;img src=&quot;https:&#x2F;&#x2F;raw.githubusercontent.com&#x2F;learnbyexample&#x2F;TUI-apps&#x2F;main&#x2F;PyRegexExercises&#x2F;pyregex_exercises.png&quot; alt=&quot;Sample screenshot for Python regex exercises&quot; loading=&quot;lazy&quot; &#x2F;&gt;&lt;&#x2F;p&gt;
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&lt;span id=&quot;continue-reading&quot;&gt;&lt;&#x2F;span&gt;&lt;br&gt;
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&lt;h2 id=&quot;installation&quot;&gt;Installation&lt;a class=&quot;zola-anchor&quot; href=&quot;#installation&quot; aria-label=&quot;Anchor link for: installation&quot;&gt;🔗&lt;&#x2F;a&gt;&lt;&#x2F;h2&gt;
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&lt;p&gt;This app is available on PyPI as &lt;a href=&quot;https:&#x2F;&#x2F;pypi.org&#x2F;project&#x2F;regexexercises&#x2F;&quot;&gt;regexexercises&lt;&#x2F;a&gt;. Example installation instructions are shown below, adjust them based on your preferences and OS.&lt;&#x2F;p&gt;
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&lt;pre data-lang=&quot;bash&quot; style=&quot;background-color:#f5f5f5;color:#1f1f1f;&quot; class=&quot;language-bash &quot;&gt;&lt;code class=&quot;language-bash&quot; data-lang=&quot;bash&quot;&gt;&lt;span style=&quot;color:#7f8989;&quot;&gt;# virtual environment
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&lt;&#x2F;span&gt;&lt;span style=&quot;color:#5597d6;&quot;&gt;$&lt;&#x2F;span&gt;&lt;span&gt; python3&lt;&#x2F;span&gt;&lt;span style=&quot;color:#5597d6;&quot;&gt; -m&lt;&#x2F;span&gt;&lt;span&gt; venv textual_apps
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&lt;&#x2F;span&gt;&lt;span style=&quot;color:#5597d6;&quot;&gt;$&lt;&#x2F;span&gt;&lt;span&gt; cd textual_apps
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&lt;&#x2F;span&gt;&lt;span style=&quot;color:#5597d6;&quot;&gt;$&lt;&#x2F;span&gt;&lt;span&gt; source bin&#x2F;activate
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&lt;&#x2F;span&gt;&lt;span style=&quot;color:#5597d6;&quot;&gt;$&lt;&#x2F;span&gt;&lt;span&gt; pip install regexexercises
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&lt;&#x2F;span&gt;&lt;span&gt;
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&lt;&#x2F;span&gt;&lt;span style=&quot;color:#7f8989;&quot;&gt;# launch the app
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&lt;&#x2F;span&gt;&lt;span style=&quot;color:#5597d6;&quot;&gt;$&lt;&#x2F;span&gt;&lt;span&gt; regexexercises
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&lt;&#x2F;span&gt;&lt;&#x2F;code&gt;&lt;&#x2F;pre&gt;
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&lt;p&gt;To run the app without having to enter the virtual environment again, add this alias to &lt;code&gt;.bashrc&lt;&#x2F;code&gt; (or equivalent):&lt;&#x2F;p&gt;
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&lt;pre data-lang=&quot;bash&quot; style=&quot;background-color:#f5f5f5;color:#1f1f1f;&quot; class=&quot;language-bash &quot;&gt;&lt;code class=&quot;language-bash&quot; data-lang=&quot;bash&quot;&gt;&lt;span style=&quot;color:#7f8989;&quot;&gt;# you&amp;#39;ll have to change the path
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&lt;&#x2F;span&gt;&lt;span style=&quot;color:#b39f04;&quot;&gt;alias &lt;&#x2F;span&gt;&lt;span style=&quot;color:#c23f31;&quot;&gt;regexexercises&lt;&#x2F;span&gt;&lt;span style=&quot;color:#72ab00;&quot;&gt;=&lt;&#x2F;span&gt;&lt;span style=&quot;color:#d07711;&quot;&gt;&amp;#39;&#x2F;path&#x2F;to&#x2F;textual_apps&#x2F;bin&#x2F;regexexercises&amp;#39;
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&lt;&#x2F;span&gt;&lt;&#x2F;code&gt;&lt;&#x2F;pre&gt;
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&lt;p&gt;As an alternative, you can install &lt;code&gt;textual&lt;&#x2F;code&gt; (see &lt;a href=&quot;https:&#x2F;&#x2F;textual.textualize.io&#x2F;getting_started&#x2F;&quot;&gt;Textual documentation&lt;&#x2F;a&gt; for more details), clone my &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;TUI-apps&quot;&gt;TUI-apps&lt;&#x2F;a&gt; repository and run the &lt;code&gt;pyregex_exercises.py&lt;&#x2F;code&gt; file.&lt;&#x2F;p&gt;
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&lt;p&gt;Adjust the terminal dimensions for the widgets to appear properly, for example 84x25 (characters x lines).&lt;&#x2F;p&gt;
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&lt;br&gt;
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&lt;h2 id=&quot;brief-guide&quot;&gt;Brief Guide&lt;a class=&quot;zola-anchor&quot; href=&quot;#brief-guide&quot; aria-label=&quot;Anchor link for: brief-guide&quot;&gt;🔗&lt;&#x2F;a&gt;&lt;&#x2F;h2&gt;
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&lt;ul&gt;
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&lt;li&gt;Type your solution in the input box below the question.
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&lt;ul&gt;
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&lt;li&gt;Use &lt;code&gt;ip&lt;&#x2F;code&gt; variable to represent the sample input.&lt;&#x2F;li&gt;
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&lt;li&gt;Any single valid Python expression will be accepted.&lt;&#x2F;li&gt;
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&lt;li&gt;Some basic readline-like shortcuts are supported, for example &lt;strong&gt;Ctrl+u&lt;&#x2F;strong&gt;, &lt;strong&gt;Ctrl+k&lt;&#x2F;strong&gt;, &lt;strong&gt;Ctrl+w&lt;&#x2F;strong&gt;, etc&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;li&gt;Press &lt;strong&gt;Enter&lt;&#x2F;strong&gt; to execute the code.
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&lt;ul&gt;
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&lt;li&gt;Output would be displayed below the command box.&lt;&#x2F;li&gt;
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&lt;li&gt;If the output matches the expected results, the solution box will turn &lt;em&gt;green&lt;&#x2F;em&gt; and a reference solution will also be shown.&lt;&#x2F;li&gt;
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&lt;li&gt;Error messages due to exceptions will be displayed in &lt;em&gt;red&lt;&#x2F;em&gt;.&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;li&gt;Press &lt;strong&gt;Ctrl+p&lt;&#x2F;strong&gt; and &lt;strong&gt;Ctrl+n&lt;&#x2F;strong&gt; to navigate the questions list.&lt;&#x2F;li&gt;
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&lt;li&gt;Press &lt;strong&gt;Ctrl+r&lt;&#x2F;strong&gt; to toggle between &lt;strong&gt;str&lt;&#x2F;strong&gt; and &lt;strong&gt;repr&lt;&#x2F;strong&gt; — helps to spot characters like tabs, newlines, backspaces, etc.&lt;&#x2F;li&gt;
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&lt;li&gt;Press &lt;strong&gt;Ctrl+b&lt;&#x2F;strong&gt; to toggle between &lt;strong&gt;expected&lt;&#x2F;strong&gt; and &lt;strong&gt;actual&lt;&#x2F;strong&gt; — helps to debug incorrect solutions.&lt;&#x2F;li&gt;
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&lt;li&gt;Press &lt;strong&gt;Ctrl+s&lt;&#x2F;strong&gt; to show the reference solution if you are unable to solve an exercise.&lt;&#x2F;li&gt;
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&lt;li&gt;Press &lt;strong&gt;Ctrl+t&lt;&#x2F;strong&gt; to toggle between light and dark themes.&lt;&#x2F;li&gt;
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&lt;li&gt;Press &lt;strong&gt;Ctrl+q&lt;&#x2F;strong&gt; to quit the app.&lt;&#x2F;li&gt;
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&lt;li&gt;Press &lt;strong&gt;F1&lt;&#x2F;strong&gt; to view a detailed guide within the app itself and press &lt;strong&gt;F2&lt;&#x2F;strong&gt; to get back to the exercises.&lt;&#x2F;li&gt;
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&lt;&#x2F;ul&gt;
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&lt;p&gt;Your progress will be automatically saved and restored. Already answered questions will be skipped.&lt;&#x2F;p&gt;
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&lt;blockquote&gt;
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&lt;p&gt;&lt;img src=&quot;&#x2F;images&#x2F;warning.svg&quot; alt=&quot;warning&quot; &#x2F;&gt; There is no safeguard against the code you are executing. They are treated as if you executed them from a Python program.&lt;&#x2F;p&gt;
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&lt;&#x2F;blockquote&gt;
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&lt;p&gt;See &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;TUI-apps&#x2F;blob&#x2F;main&#x2F;PyRegexExercises&#x2F;app_guide.md&quot;&gt;app_guide.md&lt;&#x2F;a&gt; for more detailed instructions.&lt;&#x2F;p&gt;
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&lt;br&gt;
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&lt;h2 id=&quot;ebook&quot;&gt;Ebook&lt;a class=&quot;zola-anchor&quot; href=&quot;#ebook&quot; aria-label=&quot;Anchor link for: ebook&quot;&gt;🔗&lt;&#x2F;a&gt;&lt;&#x2F;h2&gt;
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&lt;p&gt;See my &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;py_regular_expressions&quot;&gt;Understanding Python re(gex)?&lt;&#x2F;a&gt; ebook to learn regular expressions with hundreds of examples and exercises.&lt;&#x2F;p&gt;
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&lt;br&gt;
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&lt;h2 id=&quot;feedback&quot;&gt;Feedback&lt;a class=&quot;zola-anchor&quot; href=&quot;#feedback&quot; aria-label=&quot;Anchor link for: feedback&quot;&gt;🔗&lt;&#x2F;a&gt;&lt;&#x2F;h2&gt;
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&lt;p&gt;I&#x27;d highly appreciate your feedback. Please file &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;TUI-apps&#x2F;issues&quot;&gt;an issue&lt;&#x2F;a&gt; if there are bugs, crashes, etc.&lt;&#x2F;p&gt;
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&lt;p&gt;Hope you find this TUI app useful. Happy learning :)&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>Vim tip 23: editing lines filtered by a pattern</title>
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<published>2023-03-14T00:00:00+00:00</published>
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<entry xml:lang="en">
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<title>Improve your Python regex skills with 75 interactive exercises</title>
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<published>2021-12-01T00:00:00+00:00</published>
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<updated>2022-12-09T00:00:00+00:00</updated>
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<updated>2023-03-20T00:00:00+00:00</updated>
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<link rel="alternate" href="https://learnbyexample.github.io/python-25-days-of-regex/" type="text/html"/>
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<id>https://learnbyexample.github.io/python-25-days-of-regex/</id>
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<content type="html">&lt;p&gt;Still confused about Python regular expressions? Grow your confidence with &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;py_regular_expressions&quot;&gt;Understanding Python re(gex)?&lt;&#x2F;a&gt; ebook (FREE this month!) and an &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;py_regular_expressions&#x2F;tree&#x2F;master&#x2F;interactive_exercises&quot;&gt;interactive GUI app&lt;&#x2F;a&gt;.&lt;&#x2F;p&gt;
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<content type="html">&lt;p&gt;&lt;strong&gt;(2023-03-20) Update:&lt;&#x2F;strong&gt; This &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;TUI-apps&#x2F;blob&#x2F;main&#x2F;PyRegexExercises&quot;&gt;TUI app&lt;&#x2F;a&gt; covers many more exercises compared to the GUI app discussed below.&lt;&#x2F;p&gt;
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&lt;hr&gt;
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&lt;p&gt;Still confused about Python regular expressions? Grow your confidence with &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;py_regular_expressions&quot;&gt;Understanding Python re(gex)?&lt;&#x2F;a&gt; ebook (FREE this month!) and an &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;py_regular_expressions&#x2F;tree&#x2F;8433b34bd3f03662abac25c754a5ecf871712980&#x2F;interactive_exercises&quot;&gt;interactive GUI app&lt;&#x2F;a&gt;.&lt;&#x2F;p&gt;
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&lt;p&gt;Inspired by &lt;a href=&quot;https:&#x2F;&#x2F;adventofcode.com&#x2F;&quot;&gt;Advent of Code&lt;&#x2F;a&gt;, I&#x27;ll also be posting &lt;a href=&quot;https:&#x2F;&#x2F;twitter.com&#x2F;learn_byexample&#x2F;status&#x2F;1465998844898918403&quot;&gt;3 challenges per day on twitter&lt;&#x2F;a&gt; for 25 days.&lt;&#x2F;p&gt;
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&lt;span id=&quot;continue-reading&quot;&gt;&lt;&#x2F;span&gt;&lt;br&gt;
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&lt;h2 id=&quot;free-ebook&quot;&gt;Free ebook&lt;a class=&quot;zola-anchor&quot; href=&quot;#free-ebook&quot; aria-label=&quot;Anchor link for: free-ebook&quot;&gt;🔗&lt;&#x2F;a&gt;&lt;&#x2F;h2&gt;
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&lt;p&gt;Or, you can use the &lt;a href=&quot;https:&#x2F;&#x2F;learnbyexample.github.io&#x2F;py_regular_expressions&#x2F;&quot;&gt;web version&lt;&#x2F;a&gt; if you prefer reading the book online.&lt;&#x2F;p&gt;
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&lt;br&gt;
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&lt;h2 id=&quot;interactive-gui-app&quot;&gt;Interactive GUI app&lt;a class=&quot;zola-anchor&quot; href=&quot;#interactive-gui-app&quot; aria-label=&quot;Anchor link for: interactive-gui-app&quot;&gt;🔗&lt;&#x2F;a&gt;&lt;&#x2F;h2&gt;
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&lt;p&gt;Based on the &lt;strong&gt;Understanding Python re(gex)?&lt;&#x2F;strong&gt; book contents as well as the exercises, I made an &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;py_regular_expressions&#x2F;tree&#x2F;master&#x2F;interactive_exercises&quot;&gt;interactive GUI app&lt;&#x2F;a&gt; with 75 questions on &lt;code&gt;re.search&lt;&#x2F;code&gt;, &lt;code&gt;re.sub&lt;&#x2F;code&gt;, &lt;code&gt;re.split&lt;&#x2F;code&gt; and &lt;code&gt;re.findall&lt;&#x2F;code&gt; that&#x27;ll test your understanding of anchors, alternation, grouping, escaping metacharacters, dot metacharacter, quantifiers, character class, grouping, lookarounds, flags, etc.&lt;&#x2F;p&gt;
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&lt;p&gt;Based on the &lt;strong&gt;Understanding Python re(gex)?&lt;&#x2F;strong&gt; book contents as well as the exercises, I made an &lt;a href=&quot;https:&#x2F;&#x2F;github.com&#x2F;learnbyexample&#x2F;py_regular_expressions&#x2F;tree&#x2F;8433b34bd3f03662abac25c754a5ecf871712980&#x2F;interactive_exercises&quot;&gt;interactive GUI app&lt;&#x2F;a&gt; with 75 questions on &lt;code&gt;re.search&lt;&#x2F;code&gt;, &lt;code&gt;re.sub&lt;&#x2F;code&gt;, &lt;code&gt;re.split&lt;&#x2F;code&gt; and &lt;code&gt;re.findall&lt;&#x2F;code&gt; that&#x27;ll test your understanding of anchors, alternation, grouping, escaping metacharacters, dot metacharacter, quantifiers, character class, grouping, lookarounds, flags, etc.&lt;&#x2F;p&gt;
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&lt;p&gt;Here&#x27;s some screenshots:&lt;&#x2F;p&gt;
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&lt;p align=&quot;center&quot;&gt;&lt;img src=&quot;&#x2F;images&#x2F;python_exercises&#x2F;search.png&quot; alt=&quot;Python exercise example for re.search&quot; &#x2F;&gt;&lt;&#x2F;p&gt;
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&lt;p align=&quot;center&quot;&gt;&lt;img src=&quot;&#x2F;images&#x2F;python_exercises&#x2F;sub.png&quot; alt=&quot;Python exercise example for re.sub&quot; &#x2F;&gt;&lt;&#x2F;p&gt;

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