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Asked: 2026-05-31T10:08:40+00:00

I have a string: str1 <- This is a string, that I’ve written to

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I have a string:

    str1 <- "This is a string, that I've written 
        to ask about a question, or at least tried to."

How would I :

1) count the number of commas

2) count the occurences of ‘-ion’

Any suggestions?

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1 Answer

  1. Editorial Team

    The stringr package has a function str_count that does this for you nicely.

    library(stringr)

str_count(str1, ',')
[1] 2
str_count(str1, 'ion')
[1] 1

    EDIT:

    Cause I was curious:

    vec <- paste(sample(letters, 1e6, replace=T), collapse=' ')

system.time(str_count(vec, 'a'))
   user  system elapsed 
  0.052   0.000   0.054 

system.time(length(gregexpr('a', vec, fixed=T)[[1]]))
   user  system elapsed 
  2.124   0.016   2.146 

system.time(length(gregexpr('a', vec, fixed=F)[[1]]))
   user  system elapsed 
  0.052   0.000   0.052 
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