cc Update messages.json
diff --git a/conformance-checkers/messages.json b/conformance-checkers/messages.json
index 73e1d69..1bdb90d 100644
--- a/conformance-checkers/messages.json
+++ b/conformance-checkers/messages.json
@@ -968,8 +968,8 @@
     "html/elements/img/usemap-bad-value-novalid.html": "Bad value \u201c#\u201d for attribute \u201cusemap\u201d on element \u201cimg\u201d: Bad hash-name reference: A hash-name reference must have at least one character after \u201c#\u201d.",
     "html/elements/img/width-height-negative-novalid.html": "Bad value \u201c-1\u201d for attribute \u201cwidth\u201d on element \u201cimg\u201d: Bad non-negative integer: Expected a digit but saw \u201c-\u201d instead.",
     "html/elements/input/list-novalid.html": "The \u201clist\u201d attribute of the \u201cinput\u201d element must refer to a \u201cdatalist\u201d element.",
-    "html/elements/input/pattern-asterisk-novalid.html": "Bad value \u201c*\u201d for attribute \u201cpattern\u201d on element \u201cinput\u201d: Bad pattern: Invalid regular expression: \u201c*\u201d: Nothing to repeat.",
-    "html/elements/input/pattern-paren-novalid.html": "Bad value \u201c(\u201d for attribute \u201cpattern\u201d on element \u201cinput\u201d: Bad pattern: Invalid regular expression: \u201c(\u201d: Unterminated group.",
+    "html/elements/input/pattern-asterisk-novalid.html": "Bad value \u201c*\u201d for attribute \u201cpattern\u201d on element \u201cinput\u201d: Bad pattern: Dangling meta character '*' near index 0",
+    "html/elements/input/pattern-paren-novalid.html": "Bad value \u201c(\u201d for attribute \u201cpattern\u201d on element \u201cinput\u201d: Bad pattern: Unclosed group near index 1",
     "html/elements/input/type-image-formaction-empty-novalid.html": "Bad value \u201c\u201d for attribute \u201cformaction\u201d on element \u201cinput\u201d: Bad URL: Must be non-empty.",
     "html/elements/input/type-image-formaction-whitespace-only-novalid.html": "Bad value \u201c\t \n\u201d for attribute \u201cformaction\u201d on element \u201cinput\u201d: Bad URL: Must be non-empty.",
     "html/elements/input/type-image-formaction/fragment-backslash-novalid.html": "Bad value \u201c#\\\u201d for attribute \u201cformaction\u201d on element \u201cinput\u201d: Bad URL: Illegal character in fragment: \u201c\\\u201d is not allowed.",