Bump regex from 2026.1.15 to 2026.2.19 (#12100)

Bumps [regex](https://github.com/mrabarnett/mrab-regex) from 2026.1.15
to 2026.2.19.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/mrabarnett/mrab-regex/blob/hg/changelog.txt">regex's
changelog</a>.</em></p>
<blockquote>
<p>Version: 2026.2.19</p>
<pre><code>Added \z as alias of \Z, like in re module.
<p>Added prefixmatch as alias of match, like in re module.<br />
</code></pre></p>
<p>Version: 2026.1.15</p>
<pre><code>Re-uploaded.
</code></pre>
<p>Version: 2026.1.14</p>
<pre><code>Git issue 596: Specifying {e&lt;=0} causes ca 210× slow-down.
<p>Added RISC-V wheels.<br />
</code></pre></p>
<p>Version: 2025.11.3</p>
<pre><code>Git issue 594: Support relative PARNO in recursive
subpatterns.
</code></pre>
<p>Version: 2025.10.23</p>
<pre><code>'setup.py' was missing from the source distribution.
</code></pre>
<p>Version: 2025.10.22</p>
<pre><code>Fixed test in main.yml.
</code></pre>
<p>Version: 2025.10.21</p>
<pre><code>Moved tests into subfolder.
</code></pre>
<p>Version: 2025.10.20</p>
<pre><code>Re-organised files.
<p>Updated to Unicode 17.0.0.<br />
</code></pre></p>
<p>Version: 2025.9.20</p>
<pre><code>Enable free-threading support in cibuildwheel in another
place.
</code></pre>
<p>Version: 2025.9.19</p>
<pre><code>Enable free-threading support in cibuildwheel.
</code></pre>
<p>Version: 2025.9.18</p>
<pre><code>Git issue 565: Support the free-threaded build of CPython
3.13
</code></pre>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/mrabarnett/mrab-regex/commit/9789c2284ff1fc41aee38ccd2a2508608afeb2e6"><code>9789c22</code></a>
Added \z as alias of \Z, like in re module.</li>
<li>See full diff in <a
href="https://github.com/mrabarnett/mrab-regex/compare/2026.1.15...2026.2.19">compare
view</a></li>
</ul>
</details>
<br />


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requirements/constraints.txt

@@ -201,7 +201,7 @@ pyyaml==6.0.3
     # via pre-commit
 re-assert==1.1.0
     # via -r requirements/test-common.in
-regex==2026.1.15
+regex==2026.2.19
     # via re-assert
 requests==2.32.5
     # via

requirements/dev.txt

@@ -196,7 +196,7 @@ pyyaml==6.0.3
     # via pre-commit
 re-assert==1.1.0
     # via -r requirements/test-common.in
-regex==2026.1.15
+regex==2026.2.19
     # via re-assert
 requests==2.32.5
     # via sphinx

requirements/test-common.txt

@@ -87,7 +87,7 @@ python-on-whales==0.80.0
     # via -r requirements/test-common.in
 re-assert==1.1.0
     # via -r requirements/test-common.in
-regex==2026.1.15
+regex==2026.2.19
     # via re-assert
 rich==14.3.2
     # via pytest-codspeed

requirements/test-ft.txt

@@ -122,7 +122,7 @@ python-on-whales==0.80.0
     # via -r requirements/test-common.in
 re-assert==1.1.0
     # via -r requirements/test-common.in
-regex==2026.1.15
+regex==2026.2.19
     # via re-assert
 rich==14.3.2
     # via pytest-codspeed

requirements/test.txt

@@ -122,7 +122,7 @@ python-on-whales==0.80.0
     # via -r requirements/test-common.in
 re-assert==1.1.0
     # via -r requirements/test-common.in
-regex==2026.1.15
+regex==2026.2.19
     # via re-assert
 rich==14.3.2
     # via pytest-codspeed