diff --git a/files/en-us/web/html/element/input/index.md b/files/en-us/web/html/element/input/index.md
index c12fbc3eb8e2d04..992dbcf18a66a41 100644
--- a/files/en-us/web/html/element/input/index.md
+++ b/files/en-us/web/html/element/input/index.md
@@ -534,9 +534,12 @@ A few additional non-standard attributes are listed following the descriptions o
 
 - [`pattern`](/en-US/docs/Web/HTML/Attributes/pattern)
 
-  - : Valid for `text`, `search`, `url`, `tel`, `email`, and `password`, the `pattern` attribute defines a regular expression that the input's [`value`](#value) must match in order for the value to pass [constraint validation](/en-US/docs/Web/HTML/Constraint_validation). It must be a valid JavaScript regular expression, as used by the {{jsxref("RegExp")}} type, and as documented in our [guide on regular expressions](/en-US/docs/Web/JavaScript/Guide/Regular_expressions); the `'u'` flag is specified when compiling the regular expression, so that the pattern is treated as a sequence of Unicode code points, instead of as {{Glossary("ASCII")}}. No forward slashes should be specified around the pattern text.
+  - : Valid for `text`, `search`, `url`, `tel`, `email`, and `password`, the `pattern` attribute is used to compile a regular expression that the input's [`value`](#value) must match in order for the value to pass [constraint validation](/en-US/docs/Web/HTML/Constraint_validation). It must be a valid JavaScript regular expression, as used by the {{jsxref("RegExp")}} type, and as documented in our [guide on regular expressions](/en-US/docs/Web/JavaScript/Guide/Regular_expressions). No forward slashes should be specified around the pattern text. When compiling the regular expression:
 
-    If the `pattern` attribute is present but is not specified or is invalid, no regular expression is applied and this attribute is ignored completely. If the pattern attribute is valid and a non-empty value does not match the pattern, constraint validation will prevent form submission.
+    1. the pattern will be implicitly wrapped with `^(?:` and `)$`, such that the match is required against the _entire_ input value, i.e., `^(?:<pattern>)$`.
+    2. the `'v'` flag is specified so that the pattern is treated as a sequence of Unicode code points, instead of as {{Glossary("ASCII")}}.
+
+    If the `pattern` attribute is present but is not specified or is invalid, no regular expression is applied and this attribute is ignored completely. If the pattern attribute is valid and a non-empty value does not match the pattern, constraint validation will prevent form submission. If the [`multiple`](/en-US/docs/Web/HTML/Attributes/multiple) is present, the compiled regular expression is matched against each comma separated value.
 
     > [!NOTE]
     > If using the `pattern` attribute, inform the user about the expected format by including explanatory text nearby. You can also include a [`title`](#title) attribute to explain what the requirements are to match the pattern; most browsers will display this title as a tooltip. The visible explanation is required for accessibility. The tooltip is an enhancement.