Regex for "is every character in string numeric?"

Asked Dec 19 '18 at 17:38

Active Dec 19 '18 at 17:58

Viewed 470 times

I'm wondering what regex pattern I could use to detect if every character in a string is numeric.

So, here's what I'm thinking that isn't working:

stringr::str_detect("311apple", "[0-9]")
#> [1] TRUE

That statement is TRUE because there exists a numeric character in that string, but I'm trying to find a pattern so that it's only TRUE if every character is numeric.

Any ideas? Thanks!

edited Dec 19 '18 at 17:48

asked Dec 19 '18 at 17:38

Evan O.

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Use `^[0-9]+$`. – Wiktor Stribiżew Dec 19 '18 at 17:40
FWIW I saw the answer that this is a "duplicate" of, but it doesn't look like the answers are applicable to R. Also, maybe I can re-think this as a "detect if there are any non-numeric characters" potentially. – Evan O. Dec 19 '18 at 17:41
Thanks for the response @WiktorStribiżew. Want to turn that into an answer? – Evan O. Dec 19 '18 at 17:43
There are a lot of patterns that are applicable in R, https://stackoverflow.com/a/9011537/3832970, https://stackoverflow.com/a/9011683/3832970 – Wiktor Stribiżew Dec 19 '18 at 17:46
Ah, I missed the ones near the bottom. My apologies. Should I delete? – Evan O. Dec 19 '18 at 17:48
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Another good R solution - https://stackoverflow.com/a/43195631/3832970 – Wiktor Stribiżew Dec 19 '18 at 17:58

Regex for "is every character in string numeric?"

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