Ignoring case when matching

Rather than transforming the input strings, another approach is to specify that the matching should be case insensitive. This is one of the options to the stringr regex() function.

Take our previous example,

x <- c("Cat", "CAT", "cAt") 
str_view(x, "cat")

To match the pattern cat in a case insensitive way, we wrap our pattern in regex() and specify the argument ignore_case = TRUE,

str_view(x, regex("cat", ignore_case = TRUE))

Notice that the matches retain their original case and any variant of cat matches.

Try it out to find the catcidents that involved tripping.

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String Manipulation with stringr in R

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交互式实操练习

通过完成这段示例代码来试试这个练习。

# View matches to "TRIP"
___

# Construct case insensitive pattern
trip_pattern <- ___

# View case insensitive matches to "TRIP"
___

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