[R] regular expression question

Gabor Grothendieck ggrothendieck at gmail.com
Mon Jun 12 05:01:23 CEST 2006

This will delete numbers at the end:

sub("[0-9]+$", "", c("AAL123", "XELB245", "A247"))

If you want remove all numbers its just:

gsub("[0-9]", "", c("AAL123", "XELB245", "A247"))

On 6/11/06, markleeds at verizon.net <markleeds at verizon.net> wrote:
> I am very much a novice with regular expressions and I have spent
> a decent amount of time trying to do the following and I can't
> get it.
> i have variables that are of type character but
> they have number characters at the end. for example :
> "AAL123"
> "XELB245"
> "A247"
> I want a command that gives me just gives me the letter characters
> for each one.
> the letter characters always start first and then the number characters come second and it never flips back to letter characters
> once the number characters start. i am using R-2.20 on
> windows Xp. Thanks. substring doesn't work because the
> length of the letter characters can vary.
> always occur first with the numbers starting
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