added 29th Python tip

Author: learnbyexample

README.md

@@ -68,6 +68,7 @@ I'm addicted to reading fantasy/sci-fi books, so I have a [blog](https://learnby
 
 ## Tips
 
+* [Python tip 29: negative lookarounds](https://learnbyexample.github.io/tips/python-tip-29/)
 * [Vim tip 27: regexp anchors](https://learnbyexample.github.io/tips/vim-tip-27/)
 * [CLI tip 28: substitute specific occurrence with GNU sed](https://learnbyexample.github.io/tips/cli-tip-28/)
 * [Python tip 28: string concatenation and repetition](https://learnbyexample.github.io/tips/python-tip-28/)

atom.xml

@@ -128,17 +128,17 @@
 </span><span>(</span><span style=color:#b3933a;>9</span><span>, </span><span style=color:#b3933a;>13</span><span>)
 </span></code></pre><ul><li>examples for <code>re.sub()</code></ul><pre class=language-python data-lang=python style=background-color:#f5f5f5;color:#1f1f1f;><code class=language-python data-lang=python><span style=color:#7f8989;># add something to the start of every line
 </span><span style=color:#72ab00;>>>> </span><span>ip_lines </span><span style=color:#72ab00;>= </span><span style=color:#d07711;>"catapults</span><span style=color:#aeb52b;>\n</span><span style=color:#d07711;>concatenate</span><span style=color:#aeb52b;>\n</span><span style=color:#d07711;>cat"
-</span><span style=color:#72ab00;>>>> </span><span style=color:#b39f04;>print</span><span>(re.</span><span style=color:#5597d6;>sub</span><span>(</span><span style=color:#668f14;>r</span><span style=color:#d07711;>'</span><span style=color:#72ab00;>^</span><span style=color:#d07711;>'</span><span>, </span><span style=color:#668f14;>r</span><span style=color:#d07711;>'</span><span style=color:#72ab00;>* </span><span style=color:#d07711;>'</span><span>, ip_lines, </span><span style=color:#5597d6;>flags</span><span style=color:#72ab00;>=</span><span>re.M))
+</span><span style=color:#72ab00;>>>> </span><span style=color:#b39f04;>print</span><span>(re.</span><span style=color:#5597d6;>sub</span><span>(</span><span style=color:#668f14;>r</span><span style=color:#d07711;>'</span><span style=color:#72ab00;>^</span><span style=color:#d07711;>'</span><span>, </span><span style=color:#d07711;>'* '</span><span>, ip_lines, </span><span style=color:#5597d6;>flags</span><span style=color:#72ab00;>=</span><span>re.M))
 </span><span style=color:#72ab00;>* </span><span>catapults
 </span><span style=color:#72ab00;>* </span><span>concatenate
 </span><span style=color:#72ab00;>* </span><span>cat
 </span><span>
 </span><span style=color:#7f8989;># replace 'par' only at the start of a word
-</span><span style=color:#72ab00;>>>> </span><span>re.</span><span style=color:#5597d6;>sub</span><span>(</span><span style=color:#668f14;>r</span><span style=color:#d07711;>'</span><span style=color:#72ab00;>\b</span><span style=color:#7c8f4c;>par</span><span style=color:#d07711;>'</span><span>, </span><span style=color:#668f14;>r</span><span style=color:#d07711;>'</span><span style=color:#7c8f4c;>X</span><span style=color:#d07711;>'</span><span>, </span><span style=color:#d07711;>'par spar apparent spare part'</span><span>)
+</span><span style=color:#72ab00;>>>> </span><span>re.</span><span style=color:#5597d6;>sub</span><span>(</span><span style=color:#668f14;>r</span><span style=color:#d07711;>'</span><span style=color:#72ab00;>\b</span><span style=color:#7c8f4c;>par</span><span style=color:#d07711;>'</span><span>, </span><span style=color:#d07711;>'X'</span><span>, </span><span style=color:#d07711;>'par spar apparent spare part'</span><span>)
 </span><span style=color:#d07711;>'X spar apparent spare Xt'
 </span><span>
 </span><span style=color:#7f8989;># same as: r'part|parrot|parent'
-</span><span style=color:#72ab00;>>>> </span><span>re.</span><span style=color:#5597d6;>sub</span><span>(</span><span style=color:#668f14;>r</span><span style=color:#d07711;>'</span><span style=color:#7c8f4c;>par(en</span><span style=color:#72ab00;>|</span><span style=color:#7c8f4c;>ro)</span><span style=color:#72ab00;>?</span><span style=color:#7c8f4c;>t</span><span style=color:#d07711;>'</span><span>, </span><span style=color:#668f14;>r</span><span style=color:#d07711;>'</span><span style=color:#7c8f4c;>X</span><span style=color:#d07711;>'</span><span>, </span><span style=color:#d07711;>'par part parrot parent'</span><span>)
+</span><span style=color:#72ab00;>>>> </span><span>re.</span><span style=color:#5597d6;>sub</span><span>(</span><span style=color:#668f14;>r</span><span style=color:#d07711;>'</span><span style=color:#7c8f4c;>par(en</span><span style=color:#72ab00;>|</span><span style=color:#7c8f4c;>ro)</span><span style=color:#72ab00;>?</span><span style=color:#7c8f4c;>t</span><span style=color:#d07711;>'</span><span>, </span><span style=color:#d07711;>'X'</span><span>, </span><span style=color:#d07711;>'par part parrot parent'</span><span>)
 </span><span style=color:#d07711;>'par X X X'
 </span><span>
 </span><span style=color:#7f8989;># remove first two columns where : is delimiter
@@ -178,7 +178,7 @@
 </span><span style=color:#d07711;>'hey dogs! cat42 dog_5 dogdog'
 </span><span>
 </span><span style=color:#7f8989;># change whole word only if it is not preceded by : or -
-</span><span style=color:#72ab00;>>>> </span><span>re.</span><span style=color:#5597d6;>sub</span><span>(</span><span style=color:#668f14;>r</span><span style=color:#d07711;>'</span><span style=color:#7c8f4c;>(</span><span style=color:#aeb52b;>?&LT![:-]</span><span style=color:#7c8f4c;>)</span><span style=color:#72ab00;>\b</span><span style=color:#aeb52b;>\w</span><span style=color:#72ab00;>+\b</span><span style=color:#d07711;>'</span><span>, </span><span style=color:#668f14;>r</span><span style=color:#d07711;>'</span><span style=color:#7c8f4c;>X</span><span style=color:#d07711;>'</span><span>, </span><span style=color:#d07711;>':cart &LTapple -rest ;tea'</span><span>)
+</span><span style=color:#72ab00;>>>> </span><span>re.</span><span style=color:#5597d6;>sub</span><span>(</span><span style=color:#668f14;>r</span><span style=color:#d07711;>'</span><span style=color:#7c8f4c;>(</span><span style=color:#aeb52b;>?&LT![:-]</span><span style=color:#7c8f4c;>)</span><span style=color:#72ab00;>\b</span><span style=color:#aeb52b;>\w</span><span style=color:#72ab00;>+</span><span style=color:#d07711;>'</span><span>, </span><span style=color:#d07711;>'X'</span><span>, </span><span style=color:#d07711;>':cart &LTapple -rest ;tea'</span><span>)
 </span><span style=color:#d07711;>':cart &LTX -rest ;X'
 </span><span>
 </span><span style=color:#7f8989;># extract digits only if it is preceded by - and followed by ; or :

python-regex-cheatsheet/index.html

@@ -192,7 +192,7 @@
     </url>
     <url>
         <loc>https://learnbyexample.github.io/python-regex-cheatsheet/</loc>
-        <lastmod>2023-02-10</lastmod>
+        <lastmod>2023-06-13</lastmod>
     </url>
     <url>
         <loc>https://learnbyexample.github.io/python-regex-playground/</loc>
@@ -428,7 +428,7 @@
     </url>
     <url>
         <loc>https://learnbyexample.github.io/tips/</loc>
-        <lastmod>2023-06-05</lastmod>
+        <lastmod>2023-06-13</lastmod>
     </url>
     <url>
         <loc>https://learnbyexample.github.io/tips/cli-tip-1/</loc>
@@ -626,6 +626,10 @@
         <loc>https://learnbyexample.github.io/tips/python-tip-28/</loc>
         <lastmod>2023-05-24</lastmod>
     </url>
+    <url>
+        <loc>https://learnbyexample.github.io/tips/python-tip-29/</loc>
+        <lastmod>2023-06-13</lastmod>
+    </url>
     <url>
         <loc>https://learnbyexample.github.io/tips/python-tip-3/</loc>
         <lastmod>2022-05-16</lastmod>