URLs generated from a page title that combines non-ASCII and ASCII characters separated by a period results in a 404 error

Issue Summary

The URL generated from a page title that combines non-ASCII and ASCII characters separated by a period will result in a 404 error.

Steps to Reproduce

1. Create a page in Confluence, and name it "€ . Test"
2. The link that's generated will be in the format ".+Test"

Other examples you can use to test:

•  テストページ. Test Page
• Тестовая страница. Test Page

Three things need to happen in order to reproduce the issue:

1. The title has to begin with non-ASCII characters. This includes symbols and also non-English characters, such as Chinese/Japanese/Korean (CJK) characters, accent marks, and Cyrillic.
2. There has to be a period immediately following the non-ASCII characters. I was unable to reproduce the issue with any other punctuation.
3. After the period, there must be some ASCII characters.

Expected Results

Generally, Confluence would ignore the non-ASCII characters and generate the URL without a title, for example,  /wiki/spaces/KEY/pages/1234567/

Actual Results

The generated page URL ignores the non-ASCII characters and begins the page title with a period/decimal, followed by the ASCII characters.

When you try to visit that URL, you encounter a 404 error. (This is due to related bug CONFCLOUD-78305) 

404 Not Found

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openresty

Workaround

1. Update the title:
   1. Remove the period from the title, or
   2. Change the title so it starts with ASCII characters, or
   3. Remove either the non-ASCII or ASCII characters (so the title doesn't combine the two)
2. Otherwise, share the page tiny link, either available from Page information or by clicking on the 🔗 link icon in the top-right of the page.