RE: [R] removing characters from a string

From: John Fox <>
Date: Tue 12 Apr 2005 - 23:14:17 EST

Dear Vivek,

Actually, I think R has reasonably good facilities for manipulating strings. See ?gsub etc.; for example:

gsub("[^0-9]", "", "XKa0&*1jk2")
[1] "012"

I hope this helps,

John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4

> -----Original Message-----
> From:
> [] On Behalf Of Vivek Rao
> Sent: Tuesday, April 12, 2005 7:55 AM
> To:
> Subject: [R] removing characters from a string
> Is there a simple way in R to remove all characters from a
> string other than those in a specified set? For example, I
> want to keep only the digits 0-9 in a string.
> In general, I have found the string handling abilities of R a
> bit limited. (Of course it's great for stats in general). Is
> there a good reference on this? Or should R programmers dump
> their output to a text file and use something like Perl or
> Python for sophisticated text processing?
> I am familiar with the basic functions such as nchar,
> substring, as.integer, print, cat, sprintf etc.
> mailing list PLEASE do read the posting guide! Received on Tue Apr 12 23:41:02 2005

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