[R] Numbers in a string

[Martin Maechler]

>>>>> Petr Savicky <savicky at cs.cas.cz>
>>>>>     on Wed, 15 Dec 2010 14:21:37 +0100 writes:

    > On Wed, Dec 15, 2010 at 11:08:06AM -0200, Henrique
    > Dallazuanna wrote:
    >> Try this:
    >> 
    >> gsub("[^0-9]", "", "AB15E9SDF654VKBN?dvb.65")

    > Consider also

    >   strsplit("AB15E9SDF654VKBN?dvb.65", "[^.0-9][^.0-9]*")
    > [[1]] [1] "" "15" "9" "654" ".65"

which can be abbreviated to 

       strsplit("AB15E9SDF654VKBN?dvb.65", "[^.0-9]+")

Note: 
 R's regular expression matching capability is really very close to Perl's
 and in those cases it is not, these functions have an argument
 'perl' (default FALSE) you can switch on.

Martin


    >> On Wed, Dec 15, 2010 at 6:55 AM, Luis Felipe Parra <
    >> felipe.parra at quantil.com.co> wrote:
    >> 
    >> > Hello, I have stings which have all sort of characters
    >> (numbers, letters, > punctuation marks, etc) I would like
    >> to stay only with the numbers in them, > does somebody
    >> know how to do this?
    >> >
    >> > Thank you
    >> >
    >> > Felipe Parra

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