I have the following dataframe:
aa123 aa123.1 aa456 aa456.1
1 2 3 4
I want to take only the columns that match a pattern: "aa[numbers].1". In other words to extract only the columns that end with ".1".
I have tried to use regular expression pattern for grep and dplyr select/filter + ends_with() with pattern = ".1"
But nothing seems to work, please advise me how can I build such pattern and point me to a guide how in the future to build the pattern I need.
You want to use a regular expression that matches a dot ( \\.
) followed with 1
followed with end of string ( $
).
Use the following regex then:
"\\.1$"
The dot must be escaped to match a literal dot.
See the regex demo .
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