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Hello, After viewing this SO question, I thought that a function styleRegex could be nice. But I have not thought yet how it could be designed (I'm not familiar with formatStyle, I always use JavaScript). What do you think?

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Maybe something like

color = styleRegex(c("OK$", "ERROR$"), c("green", "red"))

Or styleGrep? We could also allow the grepl options (fixed, perl, ...).