To count the number of pattern matches in R we use str_count() function. Let’s see how to get the count of pattern matches in R with an example.

Let’s first create the dataframe.

df1 = data.frame(Name = c('George','Andrea', 'Micheal','Maggie','Ravi','Xien','Jalpa'), Mathematics_score=c(45,78,44,89,66,NaN,NaN)) df1

so the dataframe will be

**Count the number of pattern matches in R:**

str_count() function is used to count the number of pattern matches in R

library(stringr) df1$A_count <- str_count(df1$Name,"a") df1

number of “a” in the column “Name” is counted as shown. So the resultant dataframe will be