Confluence (Cloud) content search problem (looking for URL links in pages) - solution! :)

[Shawn in Van]

I had begun this question with frustration, but then accidentally stumbled upon the solution. :)

If you wish to search for URL inside Confluence content, use the following regex expression syntax:

/.*{URL}.*/

For example, I wanted to find every Confluence reference to our deprecated Google Site, so I searched for: /.*sites.google.com.*/

JOY!

[Shawn in Van]

Update: 
Davin Studer goes into more detail on how to make regular expression queries in Confluence. Thanks @Davin Studer!

https://community.atlassian.com/t5/Confluence-questions/How-do-I-search-Confluence-for-an-external-URL/qaq-p/749437