How to filter for rows using multiple conditions for strings-CodePudding

How can I filter rows in df based on multiple conditions with strings? I want to extract all rows with the string 'CH-4752' OR 'ER-9987'.

In other words, go from this:

df

identifier        unit

ABCD-CH-4752-01X  27  
ABCD-CH-4752-11X  15
ABCD-AZ-5155-01X  6
ABCD-ER-9987-01X  27  
ABCD-ER-9987-11X  15
ABCD-GH-5230-01X  72
ABCD-UI-9078-01X  9
ABCD-OP-7489-01X  88

to this:

df

identifier        unit

ABCD-CH-4752-01X  27  
ABCD-CH-4752-11X  15
ABCD-ER-9987-01X  27  
ABCD-ER-9987-11X  15

CodePudding user response：

You can try this using grep

df[grep("CH-4752|ER-9987",df$identifier),]
        identifier unit
1 ABCD-CH-4752-01X   27
2 ABCD-CH-4752-11X   15
4 ABCD-ER-9987-01X   27
5 ABCD-ER-9987-11X   15

Data

df <- structure(list(identifier = c("ABCD-CH-4752-01X", "ABCD-CH-4752-11X",
"ABCD-AZ-5155-01X", "ABCD-ER-9987-01X", "ABCD-ER-9987-11X", "ABCD-GH-5230-01X",
"ABCD-UI-9078-01X", "ABCD-OP-7489-01X"), unit = c(27L, 15L, 6L,
27L, 15L, 72L, 9L, 88L)), class = "data.frame", row.names = c(NA,
-8L))