Search Regex shows results, but does not replace anything (solved)

I used the plugin to fix some links from material imported from the Wayback machine (my own stuff on a website that ran with an old CMS and dissapeared – long story).

The links looked like this:

<a href="https://web.archive.org/web/20160412102504/https://www.apple.com/de/iwork/pages/">Pages</a>
<a href="https://web.archive.org/web/20160412102457/https://schweiz.myspace.com/">myspace.com</a>

I tried with this search expression:

https:\/\/web\.archive\.org\/web\/\d{14}\/

Lots of hits, but no replacements.

I tried many things to locate the problem and found out that \d seems to cause it.

Ok, the obvious thing would have been to try this code:

https:\/\/web\.archive\.org\/web\/[0-9]{14}\/

That works very well!