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Comments: Make moderated or disallowed key check case-insensitive for non-Latin words.

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The `check_comment()` and `wp_check_comment_disallowed_list()` functions are expected to be case-insensitive, but that only worked for words using Latin script and consisting of ASCII characters.

This commit adds the Unicode flag to the regular expression used for the check in these functions, so that both pattern and subject can be treated as UTF-8 strings.

Reference: [https://www.php.net/manual/en/reference.pcre.pattern.modifiers.php PHP Manual: Pattern Modifiers].

Follow-up to [984], [2075], [48121], [48575].

Props bonjour52, SergeyBiryukov.
Fixes #57207.

git-svn-id: https://develop.svn.wordpress.org/trunk@54888 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Sergey Biryukov
2022-11-28 19:42:56 +00:00
parent 82c93776aa
commit 5cb17e222d
3 changed files with 40 additions and 3 deletions
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src/wp-includes/comment.php
+2 -2
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@@ -97,7 +97,7 @@ function check_comment( $author, $email, $url, $comment, $user_ip, $user_agent,
* Check the comment fields for moderation keywords. If any are found,
* fail the check for the given field by returning false.
*/
$pattern = "#$word#i";
$pattern = "#$word#iu";
if ( preg_match( $pattern, $author ) ) {
return false;
}
@@ -1357,7 +1357,7 @@ function wp_check_comment_disallowed_list( $author, $email, $url, $comment, $use
// in the spam words don't break things:
$word = preg_quote( $word, '#' );
$pattern = "#$word#i";
$pattern = "#$word#iu";
if ( preg_match( $pattern, $author )
|| preg_match( $pattern, $email )
|| preg_match( $pattern, $url )