R 中字串處理函式
阿新 • • 發佈:2019-02-17
字元完全匹配
grep()
字元不完全匹配
agrep()
字元替換
gsub()
#以上這些函式均可以通過perl=TRUE來使用正則表示式。
grep(pattern, x, ignore.case = FALSE, extended = TRUE,
perl = FALSE, value = FALSE, fixed = FALSE, useBytes = FALSE)
sub(pattern, replacement, x,
ignore.case = FALSE, extended = TRUE, perl = FALSE,
fixed = FALSE, useBytes = FALSE)
gsub(pattern, replacement, x,
ignore.case = FALSE, extended = TRUE, perl = FALSE,
fixed = FALSE, useBytes = FALSE)
regexpr(pattern, text, ignore.case = FALSE, extended = TRUE,
perl = FALSE, fixed = FALSE, useBytes = FALSE)
gregexpr (pattern, text, ignore.case = FALSE, extended = TRUE,
perl = FALSE, fixed = FALSE, useBytes = FALSE)
grep()
字元不完全匹配
agrep()
字元替換
gsub()
#以上這些函式均可以通過perl=TRUE來使用正則表示式。
grep(pattern, x, ignore.case = FALSE, extended = TRUE,
perl = FALSE, value = FALSE, fixed = FALSE, useBytes = FALSE)
sub(pattern, replacement, x,
ignore.case = FALSE, extended = TRUE, perl = FALSE,
fixed
gsub(pattern, replacement, x,
ignore.case = FALSE, extended = TRUE, perl = FALSE,
fixed = FALSE, useBytes = FALSE)
regexpr(pattern, text, ignore.case = FALSE, extended = TRUE,
perl = FALSE, fixed = FALSE, useBytes = FALSE)
gregexpr
perl = FALSE, fixed = FALSE, useBytes = FALSE)