If a text string contains something then return something in R -

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consider have df :

product                                   category    bill payment torrent power limited     recharge of videocon d2h dth               bill payment of airtel mobile recharge of idea mobile

now if string contains "bill payment" , "mobile" both want tag category "postpaid" , if string contains "recharge" , "mobile" want tag "prepaid".

i beginner in r easiest way appreciated .

result should be

product                                   category    bill payment torrent power limited    na recharge of videocon d2h dth              na bill payment of airtel mobile             postpaid recharge of idea mobile                   prepaid

we can use grep find index of 'product' both 'bill payment/mobile' ('i1') or 'recharge/mobile' ('i2'). after initializing 'category' na, replace elements based on index i1 , i2.

i1 <- grepl('bill payment', df1$product) & grepl('mobile', df1$product) i2 <- grepl('recharge', df1$product) & grepl('mobile', df1$product) df1$category <- na df1$category[i1] <- 'postpaid' df1$category[i2] <- 'prepaid' df1 #[1] na         na         "postpaid" "prepaid"

or more compact (that works example) option 

i1 <- grepl('.*bill payment.*mobile.*', df1$product) i2 <- grepl('.*recharge.*mobile.*', df1$product)

and ifelse


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