stri_split_lines: Split a String Into Text Lines

Description

These functions split each character string in a given vector into text lines.

Usage

stri_split_lines(str, omit_empty = FALSE)
stri_split_lines1(str)

Value

stri_split_lines returns a list of character vectors. If any input string is NA, then the corresponding list element is a single NA string.

stri_split_lines1(str) is equivalent to stri_split_lines(str[1])[[1]] (with default parameters), therefore it returns a character vector. Moreover, if the input string ends with a newline sequence, the last empty string is omitted from the file's contents into text lines.

Arguments

str: character vector (stri_split_lines) or a single string (stri_split_lines1)
omit_empty: logical vector; determines whether empty strings should be removed from the result [stri_split_lines only]

Author

Marek Gagolewski and other contributors

Details

Vectorized over str and omit_empty.

omit_empty is applied when splitting. If set to TRUE, then empty strings will never appear in the resulting vector.

Newlines are represented with the Carriage Return (CR, 0x0D), Line Feed (LF, 0x0A), CRLF, or Next Line (NEL, 0x85) characters, depending on the platform. Moreover, the Unicode Standard defines two unambiguous separator characters, the Paragraph Separator (PS, 0x2029) and the Line Separator (LS, 0x2028). Sometimes also the Vertical Tab (VT, 0x0B) and the Form Feed (FF, 0x0C) are used for this purpose.

These stringi functions follow UTR#18 rules, where a newline sequence corresponds to the following regular expression: (?:\u{D A}|(?!\u{D A})[\u{A}-\u{D}\u{85}\u{2028}\u{2029}]. Each match serves as a text line separator.

References

Unicode Newline Guidelines -- Unicode Technical Report #13, https://www.unicode.org/standard/reports/tr13/tr13-5.html

Unicode Regular Expressions -- Unicode Technical Standard #18, https://www.unicode.org/reports/tr18/