Rename files: Add number to filenames

[RandomName]

When i rename multiple files I could not find a way to add numbers to the filenames. E.g.: I find several files with the name 'Rome 2018-[something].jpg. I'd like to put successive numbers to the files. Can this already be done (exept maybe with RegEx, that I cannot do)?
Otherwise I'd suggest this feature.

[raccoon]

I haven't found the ability to add sequential numbers with Everything's Rename feature, but the program RegexRenamer has this feature. Yes, you should really learn regex.

(Side note: I believe the Rename feature should be moved to Edit > Advanced > Advanced Rename)