Is it possible to search with regular expression in "Intellij Search Everywhere"?

Solution 1:

If you use ctrl+shift+f (to find in files) you can hit alt+x to enable regex searching. It's got all kinds of useful stuff.

ctrl+n (the class search) also understands '*', but not regex.

ctrl+h will show a hierarchy, but I'm not aware of a filter mechanism that might help there.

You can find other useful shortcuts here (and their Mac equivalents): https://resources.jetbrains.com/storage/products/intellij-idea/docs/IntelliJIDEA_ReferenceCard.pdf

In you first screenshot you seem to be searching a jar; in the 2nd you're actually searching 'in all places'. If you click on that dropdown you can restrict where you're searching. The filtering button might also be helpful.