Takes a string and breaks it into seperate substrings where there are newline characters.
string.break.line(string)
character vector to be separated into many lines.
Returns a list that is the same length of as the string
argument.
Each list element is a character vector.
Each character vectors elements are the
split lines of the corresponding element in the string
argument vector.
# NOT RUN {
a <- c('', 'this is a single line string',
'This is a\nmulti-line string.')
b <- string.break.line(a)
# }
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