exact matches with regular expressions

Asked Jun 13 '22 at 12:30

Active Jun 13 '22 at 12:56

Viewed 20 times

Using R, I wrote the following code to identify unique_ids in a dataframe that are not within the following range: gou200-gou250.

Today, someone inputed the id guo201 and the code below did not pick it up. I am not sure why. Any thoughts?

 team5_wrong_id=dplyr::filter(team5, !grepl('^(gou)20[1-9]|21[0-9]|22[0-9]|23[0-9]|24[0-9]|25[0]$',unique_id))

edited Jun 13 '22 at 12:56

rawr

asked Jun 13 '22 at 12:30

peppergrove

You did not group the alternatives – Wiktor Stribiżew Jun 13 '22 at 12:32
"gou200" won't match your pattern either, you can simplify to `grepl('gou2([0-4][0-9]|50)', id)` but for your pattern, you need to group like wiktor says `'^(gou)(...)'` – rawr Jun 13 '22 at 12:55
thank you sooooo much! i grouped and it worked! Serious life saver! – peppergrove Jun 13 '22 at 14:13

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