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<title>[57061] trunk/src: Coding Standards: Remove unnecessary ignore annotations in `dbDelta()`.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/57061">57061</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/57061","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>SergeyBiryukov</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2023-11-04 00:24:33 +0000 (Sat, 04 Nov 2023)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Coding Standards: Remove unnecessary ignore annotations in `dbDelta()`.

It is perfectly possible to write a commented regex with layout for readability by using the `x` modifier.

As per the manual:
> x (`PCRE_EXTENDED`)
>
> If this modifier is set, whitespace data characters in the pattern are totally ignored except when escaped or inside a character class, and characters between an unescaped # outside a character class and the next newline character, inclusive, are also ignored. This is equivalent to Perl's /x modifier, and makes it possible to include commentary inside complicated patterns.
>
> Note, however, that this applies only to data characters. Whitespace characters may never appear within special character sequences in a pattern, for example within the sequence (?( which introduces a conditional subpattern.

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

This commit rewrites these two regexes to use the `x` modifier and gets rid of the unnecessary `phpcs:disable` comments.

The tests in the `tests/phpunit/tests/db/dbDelta.php` file cover this change.

Follow-up to <a href="https://core.trac.wordpress.org/changeset/42249">[42249]</a>.

Props jrf.
See <a href="https://core.trac.wordpress.org/ticket/59650">#59650</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadminincludesupgradephp">trunk/src/wp-admin/includes/upgrade.php</a></li>
<li><a href="#trunksrcwpincludesksesphp">trunk/src/wp-includes/kses.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpadminincludesupgradephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/includes/upgrade.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/includes/upgrade.php   2023-11-03 23:27:35 UTC (rev 57060)
+++ trunk/src/wp-admin/includes/upgrade.php     2023-11-04 00:24:33 UTC (rev 57061)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2910,31 +2910,29 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                         */
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                                        // Extract type, name and columns from the definition.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                        // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
</del><span class="cx" style="display: block; padding: 0 10px">                                         preg_match(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                '/^'
-                                               .   '(?P<index_type>'             // 1) Type of the index.
-                                               .       'PRIMARY\s+KEY|(?:UNIQUE|FULLTEXT|SPATIAL)\s+(?:KEY|INDEX)|KEY|INDEX'
-                                               .   ')'
-                                               .   '\s+'                         // Followed by at least one white space character.
-                                               .   '(?:'                         // Name of the index. Optional if type is PRIMARY KEY.
-                                               .       '`?'                      // Name can be escaped with a backtick.
-                                               .           '(?P<index_name>'     // 2) Name of the index.
-                                               .               '(?:[0-9a-zA-Z$_-]|[\xC2-\xDF][\x80-\xBF])+'
-                                               .           ')'
-                                               .       '`?'                      // Name can be escaped with a backtick.
-                                               .       '\s+'                     // Followed by at least one white space character.
-                                               .   ')*'
-                                               .   '\('                          // Opening bracket for the columns.
-                                               .       '(?P<index_columns>'
-                                               .           '.+?'                 // 3) Column names, index prefixes, and orders.
-                                               .       ')'
-                                               .   '\)'                          // Closing bracket for the columns.
-                                               . '$/im',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                         '/^
+                                                       (?P<index_type>             # 1) Type of the index.
+                                                               PRIMARY\s+KEY|(?:UNIQUE|FULLTEXT|SPATIAL)\s+(?:KEY|INDEX)|KEY|INDEX
+                                                       )
+                                                       \s+                         # Followed by at least one white space character.
+                                                       (?:                         # Name of the index. Optional if type is PRIMARY KEY.
+                                                               `?                      # Name can be escaped with a backtick.
+                                                                       (?P<index_name>     # 2) Name of the index.
+                                                                               (?:[0-9a-zA-Z$_-]|[\xC2-\xDF][\x80-\xBF])+
+                                                                       )
+                                                               `?                      # Name can be escaped with a backtick.
+                                                               \s+                     # Followed by at least one white space character.
+                                                       )*
+                                                       \(                          # Opening bracket for the columns.
+                                                               (?P<index_columns>
+                                                                       .+?                 # 3) Column names, index prefixes, and orders.
+                                                               )
+                                                       \)                          # Closing bracket for the columns.
+                                               $/imx',
</ins><span class="cx" style="display: block; padding: 0 10px">                                                 $fld,
</span><span class="cx" style="display: block; padding: 0 10px">                                                $index_matches
</span><span class="cx" style="display: block; padding: 0 10px">                                        );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                        // phpcs:enable
</del><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                                        // Uppercase the index type and normalize space characters.
</span><span class="cx" style="display: block; padding: 0 10px">                                        $index_type = strtoupper( preg_replace( '/\s+/', ' ', trim( $index_matches['index_type'] ) ) );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2952,29 +2950,27 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                        // Normalize columns.
</span><span class="cx" style="display: block; padding: 0 10px">                                        foreach ( $index_columns as $id => &$index_column ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                                // Extract column name and number of indexed characters (sub_part).
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
</del><span class="cx" style="display: block; padding: 0 10px">                                                 preg_match(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                        '/'
-                                                       .   '`?'                      // Name can be escaped with a backtick.
-                                                       .       '(?P<column_name>'    // 1) Name of the column.
-                                                       .           '(?:[0-9a-zA-Z$_-]|[\xC2-\xDF][\x80-\xBF])+'
-                                                       .       ')'
-                                                       .   '`?'                      // Name can be escaped with a backtick.
-                                                       .   '(?:'                     // Optional sub part.
-                                                       .       '\s*'                 // Optional white space character between name and opening bracket.
-                                                       .       '\('                  // Opening bracket for the sub part.
-                                                       .           '\s*'             // Optional white space character after opening bracket.
-                                                       .           '(?P<sub_part>'
-                                                       .               '\d+'         // 2) Number of indexed characters.
-                                                       .           ')'
-                                                       .           '\s*'             // Optional white space character before closing bracket.
-                                                       .       '\)'                  // Closing bracket for the sub part.
-                                                       .   ')?'
-                                                       . '/',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                                 '/
+                                                               `?                      # Name can be escaped with a backtick.
+                                                                       (?P<column_name>    # 1) Name of the column.
+                                                                               (?:[0-9a-zA-Z$_-]|[\xC2-\xDF][\x80-\xBF])+
+                                                                       )
+                                                               `?                      # Name can be escaped with a backtick.
+                                                               (?:                     # Optional sub part.
+                                                                       \s*                 # Optional white space character between name and opening bracket.
+                                                                       \(                  # Opening bracket for the sub part.
+                                                                               \s*             # Optional white space character after opening bracket.
+                                                                               (?P<sub_part>
+                                                                                       \d+         # 2) Number of indexed characters.
+                                                                               )
+                                                                               \s*             # Optional white space character before closing bracket.
+                                                                       \)                  # Closing bracket for the sub part.
+                                                               )?
+                                                       /x',
</ins><span class="cx" style="display: block; padding: 0 10px">                                                         $index_column,
</span><span class="cx" style="display: block; padding: 0 10px">                                                        $index_column_matches
</span><span class="cx" style="display: block; padding: 0 10px">                                                );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                                // phpcs:enable
</del><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                                                // Escape the column name with backticks.
</span><span class="cx" style="display: block; padding: 0 10px">                                                $index_column = '`' . $index_column_matches['column_name'] . '`';
</span></span></pre></div>
<a id="trunksrcwpincludesksesphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/kses.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/kses.php    2023-11-03 23:27:35 UTC (rev 57060)
+++ trunk/src/wp-includes/kses.php      2023-11-04 00:24:33 UTC (rev 57061)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1565,8 +1565,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * Note: do NOT remove the `x` modifiers as they are essential for the above regex!
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        $validation = "%^($regex)+$%x";
-       $extraction = "%$regex%x";
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $validation = "/^($regex)+$/x";
+       $extraction = "/$regex/x";
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        if ( 1 === preg_match( $validation, $attr ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                preg_match_all( $extraction, $attr, $attrarr );
</span></span></pre>
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