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Oooo, "Roll over a match or expression for details." That was a bit subtle for me. I can't tell if there's a command line mode from a quick look at https://github.com/gskinner/regexr but the GUI seems nice:
My favorite resource for explaining regular expressions is https://myregextester.com
You might consider playing with it (especially the "explain" option) and adding it to http://tutorials.iq.harvard.edu/R/RProgramming/Rprogramming.html
Here's a sample screenshot:
I believe the output comes from http://search.cpan.org/dist/YAPE-Regex-Explain/Explain.pm which one could install locally.
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