CODEWITHSUNDEEP
rregexstring
Deepak_Spark_Beginner
Deepak_Spark_Beginner

Reputation: 273

Replace complete string if the first two characters match a pattern

I am trying to replace the complete string if the two characters matches.Below is the code I am using in R

st <- "arzo"
ret <- gsub("^ar","honor8",st)

However it replacing only the portion where it find ar and giving the below output

honor8zo

Is there a way to replace complete string if two characters matches

Upvotes: 0

Views: 457

Answers (3)

Tunn
Tunn

Reputation: 1536

Just add .* to replace the whole string:

ret <- gsub("^ar.*","honor8",st)

Upvotes: 2

Damiano Fantini
Damiano Fantini

Reputation: 1975

Using grep, in 1 line

st <- c("aaaa", "arzo", "bbb")
st[grep("^ar",st)] <- "honor8"
st

Upvotes: 0

www
www

Reputation: 39154

We can use grepl to detect the presence of target strings, and then replace them. I added two more strings (foo, bar) to st to show that this approach will only replace the complete string if the condition (^ar) is met. ret is the result of replacement.

st <- c("arzo", "foo", "bar")

ret <- st
ret[grepl("^ar", ret)] <- "honor8" 
ret
[1] "honor8" "foo"    "bar"

Upvotes: 1

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