管道与问号

R 中级正则表达式

Angelo Zehr

Data Journalist

这个或那个

lines <- c(
  "Karate Kid 2, Distributor: Columbia, 58 Screens",
  "Finding Nemo, Distributors: Pixar and Disney, 10 Screens",
  "Finding Harmony, Distributor: Unknown, 1 Screen",
  "Finding Dory, Distributors: Pixar and Disney, 8 Screens"
)

str_detect(lines, "Columbia|Pixar")

TRUE TRUE FALSE TRUE

设置可选项

str_view(lines, pattern = "Distributor|Distributors")

str_view(lines, pattern = "Distributors?")

str_view 的结果

贪婪 vs. 惰性

str_view("Toy Story 3 In Disney Digital 3D", ".*3")

str_view 贪婪模式的结果

str_view("Toy Story 3 In Disney Digital 3D", ".*?3")

str_view 惰性模式的结果

让我们来练习！

R 中级正则表达式