CODEWITHSUNDEEP
rregexgrepl
hamaor
hamaor

Reputation: 41

Check if a string contain digits and dash

I'm trying to find the right regex to grepl weather a string contains digits[0-9] and the special character "-" only.

ex,

str1="00-25" #TRUE
str2="0a-2" #FALSE

I have tried 

grepl("[^[:digit:]|-]",str2)
#[1] TRUE

thoughts?

Upvotes: 2

Views: 5043

Answers (1)

Daniel E.
Daniel E.

Reputation: 2480

You want to check if the string has only digit and -.

To create the ensemble, you need to use "[]" so :

[0-9-]

Now you want to check that every character of the string is in the ensemble you have created, in other term you want to start(^) and finish($) by this ensemble :

^[0-9-]$

Finally in the variable there is 1 or more character, so I use the "+" :

grepl("^[0-9-]+$",str)

Upvotes: 3

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