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  1. v <- "((2-x^2+3)^2+(x-5+7)^10)^0.5"
  2. x <- grepl("(\\(((?:[^()]++|(?1))*)\\))\\^(\\d*\\.?\\d+)", v, perl=TRUE)
  3. while(x) {
  4. 	v <- sub("(\\(((?:[^()]++|(?1))*)\\))\\^(\\d*\\.?\\d+)", "pow(\\2, \\3)", v, perl=TRUE);
  5. 	x = grepl("(\\(((?:[^()]++|(?1))*)\\))\\^(\\d*\\.?\\d+)", v, perl=TRUE)
  6. }
  7. v
Success #stdin #stdout 0.22s 60752KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "pow(pow(2-x^2+3, 2)+pow(x-5+7, 10), 0.5)"
https://ideone.com/Y0B9uC
language:
R (R 3.5.2)
created:
8 years ago
visibility:
secret

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