Rewrite: Skip verbose page rules when permalink structure has a disambiguating stub

[himanshupathak95]

Trac ticket: https://core.trac.wordpress.org/ticket/9824

When a permalink structure like /news-and-events/%postname%/ is used, the existing regex incorrectly sets use_verbose_page_rules to true. The regex ^[^%]*%(?:postname|category|tag|author)% matches any non-% characters before the tag, including literal path stubs. This causes pages and paginated archive URLs to resolve incorrectly, because rewrite rule ordering and the extra get_page_by_path() disambiguation check are applied when they aren't needed.

This PR fixes that by using a tighter regex (^/?%(?:postname|category|tag|author)%) that only matches when the ambiguous tag is the very first path component. When a literal stub like /news/ precedes the tag, verbose page rules are correctly skipped.

Props mdawaffe for the original Trac patch.

Testing

Run tests by -

npm run test:php -- --filter=Tests_Rewrite

Use of AI Tools

For creating and testing the regex

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