r check if string contains special characters

Question

I am checking if a string contains any special characters. This is what I have, and its not working,

    if(grepl('^\\[:punct:]', val))

So if anybody can tell me what I am missing, that will be helpful.

Special characters

        ~ ` ! @# $ % ^ & * | : ; , ." |

@RichardScriven, ha , all characters like ~ ` ! @# $ % ^ & * | : ; , ." | — Jill Sellum, Apr 29 '16 at 03:08
`grepl('[^[:punct:]]', val)` is the appropriate incantation of what you were attempting I believe. — thelatemail, Apr 29 '16 at 03:11

score 5 · Answer 1 · answered Apr 27 '17 at 16:03

As @thelatemail pointed out in the comments you can use:

grepl('[^[:punct:]]', val)

which will result in TRUE or FALSE for each value in your vector. You can add sum() to the beginning of the statement to get the total number of these cases.

You can also use:

grepl('[^[:alnum:]]', val)

which will check for any value that is not a letter or a number.

r check if string contains special characters

Special characters

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