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  1. x <- "This is it, isn't it (well, yes), and (well, this, that, and this, too)"
  2. strsplit(x, "\\([^()]*\\)(*SKIP)(*F)|\\h*,\\h*", perl=T)
Success #stdin #stdout 0.47s 79168KB
stdin
Standard input is empty
stdout
[[1]]
[1] "This is it"                           
[2] "isn't it (well, yes)"                 
[3] "and (well, this, that, and this, too)"