Confluence Search: Why does the workaround with RegEx for leading wildcards not work?

[Katharina Bender]

In Page Confluence Search Syntax | Confluence Data Center and Server 8.2 | Atlassian Documentation is written that Lucene doesn't allow wildcards in the beginning of your search, but you can format your search as a regular expression as a workaround. For example, you can't search for *hum* or ?hum*, as they begin with a wildcard, but you can search for /.*hum.*/ and find things like hum, human, and inhumane.

I want to get "Diktierleiste" with /.*leiste.*/, but this is not working.