在 R 编程中从字符串中替换模式的所有匹配项 – gsub()函数

R 语言中的gsub()函数用于替换字符串中模式的所有匹配项。如果未找到该模式，则字符串将按原样返回。

Syntax:
gsub(pattern, replacement, string, ignore.case=TRUE/FALSE)

Parameters:
pattern: string to be matched
replacement: string for replacement
string: String or String vector
ignore.case: Boolean value for case-sensitive replacement

示例 1：

# R program to illustrate 
# the use of gsub() function
  
# Create a string
x <- "Geeksforgeeks"
  
# Calling gsub() function
gsub("eek", "ood", x)
  
# Calling gsub() with case-sensitivity
gsub("gee", "Boo", x, ignore.case = FALSE)
  
# Calling gsub() with case-insensitivity
gsub("gee", "Boo", x, ignore.case = TRUE)

输出：

[1] "Goodsforgoods"
[1] "GeeksforBooks"
[1] "BooksforBooks"

示例 2：

# R program to illustrate 
# the use of gsub() function
  
# Create a string
x <- c("R Example", "Java example", "Go-Lang Example")
  
# Calling gsub() function
gsub("Example", "Tutorial", x)
  
# Calling gsub() with case-insensitivity
gsub("Example", "Tutorial", x, ignore.case = TRUE)

输出：

[1] "R Tutorial"       "Java example"     "Go-Lang Tutorial"
[1] "R Tutorial"       "Java Tutorial"    "Go-Lang Tutorial"