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  1. x = "The \\' \\\\\\' \\\\\\\\'quick \\'cunning\\' brown' fox 'jumps up \\'and\\' over' the lazy dog"
  2. cat(x, sep="\n")
  3. gr <- gregexpr("(?<!\\\\)(?:\\\\{2})*\\K'[^'\\\\]*(?:\\\\.[^'\\\\]*)*'", x, perl=TRUE)
  4. mat <- regmatches(x, gr)
  5. regmatches(x, gr) <- lapply(mat, gsub, pattern="\\s", replacement="_")
  6. cat(x, sep="\n")
  7.  
Success #stdin #stdout 0.16s 178496KB
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stdin 
Standard input is empty
stdout 
The \' \\\' \\\\'quick \'cunning\' brown' fox 'jumps up \'and\' over' the lazy dog
The \' \\\' \\\\'quick_\'cunning\'_brown' fox 'jumps_up_\'and\'_over' the lazy dog
https://ideone.com/mVzCxj
language:
R (R 3.5.2)
created:
6 years ago
visibility:
public

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