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commit 10bf80c45efbaad9f8f82b9dbff039aea2f79ee8
Author: buildbot <[email protected]>
AuthorDate: Mon Sep 14 10:50:01 2026 +0000
Automatic Site Publish by Buildbot
---
output/core-developers/client-side-validation.html | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/output/core-developers/client-side-validation.html
b/output/core-developers/client-side-validation.html
index 869ab0ee4..e81005113 100644
--- a/output/core-developers/client-side-validation.html
+++ b/output/core-developers/client-side-validation.html
@@ -329,6 +329,14 @@ whitespace set, so a pattern like <code
class="language-plaintext highlighter-ro
and reject it in the browser. Any regex using a construct outside this
allowlist simply gets no <code class="language-plaintext
highlighter-rouge">pattern</code>
attribute at all — it is never rejected loudly, it just quietly doesn’t get a
client-side check.</p>
+<p><strong>A <code class="language-plaintext highlighter-rouge">pattern</code>
may carry a whitespace-only alternative.</strong> <code
class="language-plaintext highlighter-rouge">RegexFieldValidator</code> skips
any value that trims to
+the empty string <em>before</em> it consults its own <code
class="language-plaintext highlighter-rouge">trim</code> param — the check is
<code class="language-plaintext
highlighter-rouge">value.trim().isEmpty()</code> — so even
+with <code class="language-plaintext highlighter-rouge">trim="false"</code> a
single space passes the server. The browser, however, skips <code
class="language-plaintext highlighter-rouge">pattern</code> only for the
+empty string and would block that space. Unless the field also carries a <code
class="language-plaintext highlighter-rouge">requiredstring</code> validator
that
+trims (its default), which rejects blank input server-side, the emitted
pattern is therefore
+<code class="language-plaintext
highlighter-rouge">(?:<regex>)|[\x00-\x20]*</code>: the original regex,
or a value made only of the characters <code class="language-plaintext
highlighter-rouge">String.trim()</code>
+strips. With a trimming <code class="language-plaintext
highlighter-rouge">requiredstring</code> present, the bare regex is emitted.</p>
+
<h3 id="data-msg--attributes"><code class="language-plaintext
highlighter-rouge">data-msg-*</code> attributes</h3>
<p>Every validator carrying a message — even one that emits no HTML constraint
attribute at all — adds a
