Search and Replace with Regex

I'm trying to use the search and replace functions, but I have run into trouble. I see that there's a regex option which is perfect because I want to select several words that a regex string would be able to capture. However, when I type something like [a-z] or [:alpha:], the search function won't highlight anything. Am I misunderstanding what the regex option means?

On my Rstudio (1.3.1093), the [a-z] does what's expected (but the classes like [:alpha:] don't work).

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