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@@ -213,6 +215,10 @@ record ----&gt; ∀ pattern matched
 fields ----&gt; run associated action
 </code></pre>
 <p>Any valid awk <code>expr</code> can be a <code>pattern</code>.</p>
+<p>An example is the regex pattern <code>/abc/ { print $1 }</code> which prints the first
+field if the record matches the regex <code>/abc/</code>. This form is actually a short
+version for <code>$0 ~ /abc/ { print $1 }</code>, see the regex comparison operator
+below.</p>
 <h3 id="special-pattern"><a class="header" href="#special-pattern">Special pattern</a></h3>
 <p>awk provides two special patterns, <code>BEGIN</code> and <code>END</code>, which can be used
 multiple times. Actions with those patterns are <strong>executed exactly once</strong>.</p>
@@ -263,6 +269,15 @@ but this is a function and return value can be assigned to a variable.</p>
 <li><code>%T</code> alias for <code>%H:%M:%S</code></li>
 </ul>
 </li>
+<li>
+<p><code>S ~ R</code>, <code>S !~ R</code></p>
+<p>The regex comparison operator, where the former returns true if the string
+<code>S</code> matches the regex <code>R</code>, and the latter is the negated form.
+The regex can be either a
+<a href="https://www.gnu.org/software/gawk/manual/html_node/Regexp-Usage.html">constant</a>
+or <a href="https://www.gnu.org/software/gawk/manual/html_node/Computed-Regexps.html">dynamic</a>
+regex.</p>
+</li>
 </ul>
 <h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
 <h3 id="filter-records"><a class="header" href="#filter-records">Filter records</a></h3>
@@ -274,6 +289,18 @@ prints the whole record.</p>
 <pre><code class="language-bash">awk '!/^#/ { print $1 }' &lt;file&gt;
 </code></pre>
 <p>Matches records not starting with <code>#</code>.</p>
+<h3 id="range-patterns"><a class="header" href="#range-patterns">Range patterns</a></h3>
+<pre><code class="language-bash">echo -e &quot;a\nFOO\nb\nc\nBAR\nd&quot; | \
+    awk '/FOO/,/BAR/ { print }'
+</code></pre>
+<p><code>/FOO/,/BAR/</code> define a range pattern of <code>begin_pattern, end_pattern</code>. When
+<code>begin_pattern</code> is matched the range is <strong>turned on</strong> and when the
+<code>end_pattern</code> is matched the range is <strong>turned off</strong>. This matches every record
+in the range <em>inclusive</em>.</p>
+<p>An <em>exclusive</em> range must be handled explicitly, for example as follows.</p>
+<pre><code class="language-bash">echo -e &quot;a\nFOO\nb\nc\nBAR\nd&quot; | \
+    awk '/FOO/,/BAR/ { if (!($1 ~ &quot;FOO&quot;) &amp;&amp; !($1 ~ &quot;BAR&quot;)) { print } }'
+</code></pre>
 <h3 id="access-last-fields-in-records"><a class="header" href="#access-last-fields-in-records">Access last fields in records</a></h3>
 <pre><code class="language-bash">echo 'a b c d e f' | awk '{ print $NF $(NF-1) }'
 </code></pre>