"sanitize_title_with_dashes" function trims dashes incorrectly

[dam6pl]

Hello,

I noticed that the "sanitize_title_with_dashes" function when parsing the query removes the dashes from the beginning and end of the page slug, resulting in all the URLs below displaying the same page:

1. ​http://example.com/sample-page/
2. ​http://example.com/sample-page---/
3. ​http://example.com/---sample-page----/

This creates problems in terms of SEO, because several pages, under different URLs, present the same page content.

I'm fully aware that changing this behaviour might break something, but maybe adding a filter to prevent it is a way?

Thanks!

[SergeyBiryukov]

Hi there, welcome back to WordPress Trac!

Thanks for the report, we're already tracking this issue in #14773.